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modcomms/prompts/channel_best_practices.md
michael 7ed2486537 Add comprehensive channel best practices specification for Gemini analysis 
Replace the 60-line placeholder with a detailed 613-line spec covering:
- 6 core creative principles and trust paradox for financial services
- Platform-specific guidelines: LinkedIn, Reddit, Instagram, Facebook, Twitter/X, YouTube
- Performance metrics and benchmarks from industry research
- Short-form video guidelines based on System1 research
- Mobile-first design requirements with touch targets and safe zones
- Copy and headline guidelines with character limits by platform
- Comprehensive violations checklist for assessment
- Measurement benchmarks and KPIs by platform

Sources: LinkedIn Creative Handbook, Reddit Mega Deck, Global Creative
Inspiration Report, LinkedIn B2C Guide, System1 research, Barclays campaigns.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
2026-01-24 12:10:36 -06:00

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Channel Best Practices Specification

This specification defines creative best practices, content strategy, and platform optimization guidelines for Barclays marketing materials. Use this to assess proof assets for channel performance and engagement effectiveness.

1. OVERVIEW

Purpose

This specification covers creative best practices for digital channels, focusing on content strategy, platform optimization, and engagement effectiveness. For brand compliance (logo, Portal, colors, typography), refer to the Brand Specification. For technical specifications (dimensions, file formats, resolution), refer to the Channel Tech Specs.

The 6 Creative Principles

All channel creative should embody these principles:

Principle Description Success Indicator
Context Aware Topical, timely, aligned with platform culture Higher engagement rate
Unified Consistent brand identity across all touchpoints Improved brand recall
Emotive & Relatable Triggers emotional reaction, uses humor, speaks audience truths More emotion reactions
Distinctively On-Brand Unique brand codes, clear category linkage Brand attribution
Scroll-Stopping Visually impactful, optimized for mobile consumption Increased dwell time
Value Exchange Addresses pain points, offers compelling insights Higher CTR, conversion

The Trust Paradox (Financial Services)

  • 50% of the population do not fully trust AI innovation
  • Emotional content drives 2.7x more followers for tech/finance brands
  • Humanize messaging - show real people's experiences
  • Lead with emotion and authenticity over technical features
  • Less than 20% of buyers can identify a bank by color alone - distinctiveness matters

2. UNIVERSAL BEST PRACTICES

Content Strategy Fundamentals

  • First 3 Seconds Rule: Key message must be visible within first 3 seconds
  • Brand Reveal: Brand should appear within first 3 seconds (80% of top-performing campaigns do this)
  • Value Proposition: Immediately visible and clearly communicated
  • Call-to-Action: Prominent, actionable, and specific

Visual Hierarchy Principles

Element Optimal Placement Rationale
Brand/Logo Top-left (images), First 3 sec (video) Eye-tracking patterns
Key Message Center/focal point Visual hierarchy
Call-to-Action Bottom or integrated with message Action completion
Supporting Elements Guide eye naturally to CTA Flow optimization

Format Performance Data

Format CTR Lift Engagement Lift Best For
Vertical (4:5, 9:16) +11% +31% Mobile feeds
Square (1:1) +4% +16% Cross-platform
Horizontal (16:9) Baseline Baseline Desktop, YouTube
GIF/Short video (<6s) +70% +17% Scroll-stopping
Video 7-15s +54% ER - Brand lift

Text & Image Ratios

  • Social posts: Maximum 20% type coverage (Barclays brand rule)
  • Text overlays increase Brand Favorability 1.5x
  • Respect platform-specific text limits in ad creative

Multi-Creative Strategy

  • Use 5-7 creatives in 90 days for +24% brand uplift
  • Refresh headlines every 3-4 weeks
  • Keep 1 in 3 headlines unique for optimal variety

3. LINKEDIN GUIDELINES

Platform Context

LinkedIn is the professional + personal intersection. Members are:

  • 62% Tech Enthusiasts
  • 47% Sports Fans
  • 40% Business Decision Makers

Creative Best Practices

Practice Metric Impact Source
Vertical format +31% ER, +11% CTR LinkedIn 2023
5-7 creatives in 90 days +24% brand uplift LinkedIn 2022
Nostalgic pop-culture references +150% CTR LinkedIn 2022
Humorous content +65% ER, +42% Lead Gen Forms LinkedIn 2023
High color contrast +15% CTR lift VidMob study
"Expert" or "Leader" in text +100% CTR VidMob 2023
Dwell time 9-11 seconds 1.2x brand awareness LinkedIn 2022

Optimal Formats

Organic Content:

  • Polls (highest organic engagement)
  • LinkedIn Live
  • Newsletters
  • Carousels (storytelling)
  • Employee advocacy posts

Paid Content:

  • Video ads (7-15 seconds optimal)
  • Carousel ads
  • Document ads
  • Thought Leader ads (+100% CTR with expert)

Copy Guidelines

  • Use alliteration, assonance, puns, and power words
  • Employ repetition and rhyming for memorability
  • Address audience pain points in conversational tone
  • Avoid B2B jargon - write for humans
  • Headlines: Maximum 65 characters
  • Body copy: Maximum 300 characters

Emotional Ecosystem

Target these emotional responses:

  • Inspired: Motivational content, success stories
  • Community & Care: Belonging, support
  • Celebratory: Achievements, milestones
  • Amused: Humor, wit (65% higher engagement)

Branding Requirements

  • Eagle: 40px height minimum (2/3 logo size for smaller formats)
  • 8px or 16px thin Portal
  • 12px spacing from edges
  • Top-right corner placement for Eagle

4. REDDIT GUIDELINES

Platform Context

  • 75% of users are mobile-first
  • #1 reason users visit: to be informed
  • Users trust brands on Reddit 46% more than other platforms
  • Community-centric - authenticity is essential

Critical Requirements

Requirement Specification Impact
Aspect ratio 4:5 preferred, 1:1 acceptable -54% CPA
Closed captions Required (build into file, not .SRT) +2.1x brand favorability
Text overlays Required on images +32% CTR
Brand in headline Required +2.4x brand awareness
Brand logo position Top-left corner +2.4x awareness, +2.3x action intent
Brand in first 3 seconds Required for video 80% of top performers

Headline Best Practices

Practice Impact
Under 150 characters +25% conversion rate
1 in 3 headlines unique +12.4% conversion lift
Include brand name +6.5% conversion, -6.5% CPA
Second person (you/your) Conversion rate lift
Clear CTA in headline -8.2% CPA
Ask a question +9.3% conversion lift
Include price point +9.4% conversion lift
Include date/urgency -3% CPA
Speak in first person +2.7% conversion lift

What NOT To Do

Anti-Pattern Impact
Emojis in headlines -3.8% conversion, +8.2% CPA
ALL CAPS (except brand names) Lower conversion rates
Headlines over 150 characters +90% higher CPA
No brand mention 25% of bottom performers made no mention
Direct community address Avoid "Hey, r/finance" style

Redditisms (Platform-Specific Language)

Using platform-native language drives 70% lower CPA:

  • TIL (Today I Learned)
  • ICYMI (In Case You Missed It)
  • IIRC (If I Remember Correctly)
  • AMA (Ask Me Anything)
  • ELI5 (Explain Like I'm 5)

Format Performance

Combination Impact
Video + Image together 10x memorability, 14x messaging recall, 3x brand favorability
Clear CTA in headline +98% installs, +240% MMP revenue
Product shown in video +1.8x brand attributes, +420% MMP revenue

C.R.A.V.E. Framework

  • Clear: Communicate straightforwardly
  • Relevant: Align with community interests
  • Authentic: Be genuine and transparent
  • Valuable: Offer something useful
  • Engaging: Encourage interaction

5. INSTAGRAM GUIDELINES

Feed Posts

  • Strong opening visual that stops the scroll
  • Clear branding (Eagle top-right, 12px from edges)
  • Carousel: Use for storytelling, end with branded frame
  • Maximum 2,200 characters caption (125 visible before "more")

Stories

  • Vertical format (9:16) optimized
  • CTA visible above "swipe up" zone
  • Avoid placing key content in top 14% (profile/close button area)
  • Avoid placing key content in bottom 15% (reply/message area)
  • 15-second maximum per story frame

Reels

  • First frame must be engaging (0.5 second hook)
  • Sound-optional viewing (text overlays/captions required)
  • 9:16 aspect ratio
  • Brand reveal in first 3 seconds
  • 90 seconds maximum (15-30 seconds optimal for performance)

Technical Specifications

Format Dimensions Safe Zones
Feed Square 1080x1080 (1:1) Full canvas
Feed Portrait 1080x1350 (4:5) Full canvas
Stories/Reels 1080x1920 (9:16) Top 14%, Bottom 15% avoid
Carousel 1080x1080 or 1080x1350 Full canvas

6. FACEBOOK GUIDELINES

Feed Content

  • Scroll-stopping visuals essential
  • Concise copy: 125 characters before truncation
  • Video: First 3 seconds critical for retention
  • Link posts: Compelling thumbnail required

Stories

  • Full-screen vertical (9:16)
  • Same safe zones as Instagram Stories
  • Top 14% and bottom 15% reserved for UI

Video Best Practices

  • Captions required (85% of videos watched without sound)
  • Brand visible in first 3 seconds
  • Key message before 10 seconds
  • Square (1:1) or portrait (4:5) outperforms landscape on mobile

Technical Specifications

Format Dimensions Text Limit
Feed Image 1200x630 or 1080x1080 125 chars primary
Feed Video 1080x1080 (1:1) or 1080x1350 (4:5) 125 chars
Stories 1080x1920 (9:16) Minimal text
Link Preview 1200x630 125 chars

7. TWITTER/X GUIDELINES

Key Considerations

  • 16px thin Portal required (platform rounds corners)
  • Concise messaging essential - fast-moving feed
  • Character limit: 280 characters

Content Best Practices

  • Strong visual to stand out
  • 1-2 hashtags maximum (strategic use)
  • Timely, topical content performs best
  • Thread format for longer narratives

Technical Specifications

Format Dimensions Notes
Image 1200x675 (16:9) Rounded corners applied
Video 1200x1200 (1:1) or 1920x1080 Max 2:20 duration
Card 800x418 For linked content
GIF 1280x1080 High engagement format

Hashtag Guidelines

  • Maximum 2 hashtags per post
  • Place at end of copy
  • Use camelCase (#BarclaysBlueRewards)
  • #Ad required for sponsored content

8. YOUTUBE GUIDELINES

Safe Zone Requirements

Format Safe Zone Guidance
Square (1:1) Use YouTube square video safe zone overlay
Vertical (9:16) Use YouTube vertical safe zone overlay
Horizontal (16:9) Use YouTube horizontal safe zone overlay
1.91:1 No standard safe zone - account for 'i' info icon
4:5 Use 9:16 safe zone centered

Video Frame Sequence (Best Practice)

  1. Hook Frame: Problem statement or attention-grabber
  2. Solution Introduction: Introduce your offering
  3. Benefit Demonstration: Show value in action
  4. CTA Frame: Clear call-to-action
  5. Brand Endframe: Full logo + tagline

Demand Gen Specifications

Format Portal Logo Position Notes
1:1 Thicker portal Standard Eagle YouTube square safe zone
1.91:1 Standard Eagle larger, further from edge Account for 'i' icon
4:5 Standard Standard spacing 9:16 safe zone centered
9:16 Standard Within safe zone YouTube vertical safe zone
16:9 Standard Within safe zone YouTube horizontal safe zone

Technical Notes

  • Video content below 50% of canvas for safe zone compliance
  • Full logo 2/3 of Eagle size
  • Place branding on solid color for legibility
  • Thicker portal for formats with rounded corners

9. SHORT-FORM VIDEO GUIDELINES

Core Principles (System1 Research)

  • Creativity matters MORE in skippable media
  • Emotional appeal quadruples brand equity
  • Short-form CAN build brand AND convert simultaneously

The 3 Cs Framework

Phase Timing Goal
Captivate 0-1 second Stop the scroll
Connect 1-7 seconds Build emotional response
Convert 7-15 seconds Clear path to action

Performance Guidelines

Element Requirement Impact
Hook First 0.5-1 second Determines scroll-stop rate
Brand reveal Within 3 seconds +80% recall
Sound design Works with sound off Accessibility, reach
Captions Always include +2.1x favorability
Length sweet spot 7-15 seconds +54% engagement rate
Quick GIFs Under 6 seconds +70% CTR

Creator/UGC Content

  • Authentic voice matters more than production value
  • Platform-native aesthetic preferred
  • Avoid over-production that feels like traditional advertising
  • Real testimonials outperform scripted content

10. MOBILE-FIRST DESIGN

Touch Target Requirements

Platform Minimum Size Recommended
iOS 44x44 pixels 48x48 pixels
Android 48x48dp 56x56dp
General 44x44 pixels 48x48 pixels

Legibility Requirements

Element Minimum Size Recommended
Body text 14px 16px
Headlines 20px 24px+
Legal text 12px 14px
CTA buttons 16px 18px

Thumb Zone Design

  • Easy Reach (bottom center): Primary actions, main CTA
  • Stretch Zone (top half): Secondary actions, navigation
  • Hard Reach (top corners): Menu, settings only

Platform Safe Zones Summary

Platform Top Avoid Bottom Avoid
Instagram/FB Stories 14% 15%
TikTok 9% 22%
YouTube Shorts Variable Navigation area
Reddit Minimal Voting UI
Twitter/X Profile area Engagement buttons

11. CREATIVE FORMATS BY OBJECTIVE

Awareness Objectives

Format Platform Why It Works
Video 15-30s LinkedIn, YouTube Dwell time drives recall
Carousel LinkedIn, Instagram Multiple messages, storytelling
Thought Leader Ad LinkedIn +100% CTR with industry expert
Takeover Reddit Maximum reach

Consideration Objectives

Format Platform Why It Works
Document Ad LinkedIn In-depth value exchange
Free-Form Ad Reddit Detailed information sharing
Video showing product Reddit +420% MMP revenue
Carousel showcase Instagram Product demonstration

Conversion Objectives

Format Platform Why It Works
Static with strong CTA Reddit Clear action path
Carousel Reddit Product showcase
Conversation Placement Reddit Higher intent audience
Lead Gen Forms LinkedIn +42% completion with humor

12. COPY & HEADLINE GUIDELINES

Barclays Tone by Product (Financial Services)

Product Writing Style Example Lead
Bank Account Simple, purposeful, warm "Make money simple"
Blue Rewards Energetic, dynamic, vivid "Make money do more"
Premier Calm, confident, elevated "Make your finances flow"

Platform Character Limits

Platform Headlines Body Copy Notes
Reddit Under 150 chars 300 max Shorter = +25% conversion
LinkedIn 65 characters 300 characters Before truncation
Facebook 125 characters 500 characters Before "See more"
Twitter/X N/A 280 characters Total post limit
Instagram N/A 125 visible 2,200 total

Linguistic Devices for Engagement

  • Alliteration: "Budget better with Barclays"
  • Assonance: Sound repetition for memorability
  • Repetition: Build phrases progressively
  • Power words: "Best," "Free," "Unlock," "Exclusive"
  • Questions: Increase engagement +9.3% (Reddit)
  • Second person: "You" and "your" drive connection

Headlines That Convert

  1. Include a simple, clear CTA
  2. Keep under 150 characters
  3. Make 1 in 3 unique (variety)
  4. Use second person pronouns
  5. Mention brand name (+6.5% conversion)
  6. Ask questions (+9.3% conversion)
  7. Include price/value when relevant (+9.4% conversion)
  8. Add urgency/timeframe (-3% CPA)

13. ACCESSIBILITY REQUIREMENTS

Video Accessibility

  • Closed captions required on ALL video content
  • Build captions into file (Reddit does not accept .SRT)
  • Captions essential: 85%+ watch videos muted
  • Ensure captions don't overlap with safe zone UI

Visual Accessibility

  • Color contrast: WCAG AA minimum (AAA preferred)
  • Never use Barclays Cyan for body copy (accessibility rule)
  • Ensure text readable at mobile sizes
  • Sufficient contrast between text and background imagery

Cognitive Accessibility

  • Clear, plain language without jargon
  • Avoid technical terms unless necessary
  • camelCase for hashtags (#AmpItUp)
  • Descriptive CTAs ("Find out more" not "Click here")

Emoji Guidelines

Platform Guidance
Reddit Avoid entirely (-3.8% conversion)
LinkedIn Use sparingly, professionally
Instagram/Facebook Maximum 3 per post
Twitter/X Use sparingly, strategically

14. VIOLATIONS CHECKLIST

Content Strategy Violations

  • Key message not visible in first 3 seconds
  • No clear call-to-action
  • Value proposition unclear or missing
  • Content not optimized for target platform
  • Generic messaging not tailored to audience

Visual Hierarchy Violations

  • Brand/logo not prominent or properly placed
  • Visual hierarchy confuses rather than guides
  • Safe zones not respected for platform
  • Text-to-image ratio exceeds 20%
  • Key content in UI overlay zones

LinkedIn-Specific Violations

  • Horizontal format used when vertical would perform better
  • Missing emotional hook or human element
  • Heavy B2B jargon in copy
  • No thought leadership angle
  • Headline exceeds 65 characters

Reddit-Specific Violations

  • Emojis used in headline or copy
  • ALL CAPS text (except brand names)
  • Headline exceeds 150 characters
  • No brand mention in headline
  • Brand logo not in top-left (images)
  • Missing closed captions on video
  • Captions uploaded as .SRT not burned in
  • Direct community address without relevance
  • Implying community endorsement

Instagram/Facebook Violations

  • Stories content in top 14% or bottom 15% zones
  • Missing captions on video content
  • First frame not engaging (Reels)
  • Poor mobile legibility
  • Landscape format on mobile-first placement

YouTube Violations

  • Safe zones not followed for format
  • Brand not visible in first 3 seconds
  • Video exceeds recommended length without justification
  • Missing captions
  • Branding not legible against background

Twitter/X Violations

  • More than 2 hashtags used
  • 8px Portal used instead of 16px (rounded corners)
  • Content exceeds 280 characters
  • Hashtags not in camelCase

Mobile-First Violations

  • Touch targets below 44x44 pixels
  • Text illegible at mobile size (below 14px body)
  • CTA in hard-reach zone (top corners)
  • Thumb-zone navigation not considered
  • Content requires zooming to read

Copy Violations

  • Headlines exceed platform character limits
  • Missing CTA in headline (Reddit especially)
  • No urgency or relevance hook
  • Jargon or complex language
  • Generic copy not personalized to platform

Accessibility Violations

  • Missing captions/subtitles on video
  • Poor color contrast (fails WCAG AA)
  • "Click here" used instead of descriptive CTA
  • Excessive emoji use (>3 per post, any on Reddit)
  • Cyan used for body copy text
  • Hashtags not in camelCase

15. MEASUREMENT & BENCHMARKS

Key Performance Indicators by Platform

Platform Primary KPIs Benchmark Target
LinkedIn CTR, Engagement Rate, Dwell Time +10% above industry average
Reddit CPA, Conversion Rate, MMP Revenue -20% CPA vs baseline
Instagram Engagement Rate, Reach, Saves +15% ER
Facebook CTR, CPM, Conversions +10% CTR
YouTube View-Through Rate, Brand Lift, CPV +20% VTR
Twitter/X Engagement Rate, Impressions +15% ER

Emotional Engagement Metrics

  • Track reaction types (Like vs Love vs Celebrate vs Funny)
  • Target 40%+ emotional reactions on high-performing content
  • Monitor sentiment in comments
  • Humorous content benchmark: +65% engagement (LinkedIn)

Creative Testing Requirements

  • Test minimum 3 creative variations per campaign
  • Refresh headlines every 3-4 weeks (Reddit guidance)
  • Use 5-7 creatives over 90 days (+24% brand uplift)
  • Keep 1 in 3 headlines unique for variety
  • A/B test CTAs, imagery, and format

Performance Red Flags

  • CTR below platform benchmark
  • CPA 20%+ above target
  • High impression, low engagement (content not resonating)
  • Video completion rate below 25%
  • Negative sentiment in comments

Version: Based on LinkedIn Creative Handbook (April 2024), Reddit Creative Best Practices Mega Deck (Q2 2025), LinkedIn Global Creative Inspiration Report (FY25 Q2), LinkedIn B2C Opportunity Guide (August 2023), System1 Short-Form Video Research, and Barclays Demand Gen Campaign Specifications (September 2025).