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name: viral-video-short-form description: Complete short-form video optimization for Instagram Reels, YouTube Shorts, and Facebook Reels. PROACTIVELY activate for: (1) Instagram Reels optimization, (2) YouTube Shorts creation, (3) Facebook Reels strategy, (4) Short-form hook creation, (5) Vertical video best practices, (6) Trending audio selection, (7) Loop optimization, (8) Quick engagement tactics. Provides: Platform-specific length recommendations, algorithm insights, hook formulas, trending strategies, caption techniques, hashtag optimization, and posting schedules. references:

• references/youtube-shorts-2026.md
• references/instagram-reels-2026.md

CRITICAL GUIDELINES

Windows File Path Requirements

MANDATORY: Always Use Backslashes on Windows for File Paths

When using Edit or Write tools on Windows, you MUST use backslashes (\) in file paths, NOT forward slashes (/).

Short-Form Video Mastery (2025-2026)

Complete guide to creating viral short-form content across Instagram Reels, YouTube Shorts, and Facebook Reels.

Platform Overview

Optimal Video Lengths

| Platform | Optimal Length | Peak Performance | Max Length | |----- | YouTube Shorts | 50-60 seconds | 55 seconds (3x views) | 3 minutes | | Instagram Reels | 7-30 seconds | 30-90 seconds | 90 seconds | | Facebook Reels | 15-30 seconds | 15-30 seconds | 90 seconds |

Technical Specifications

The 1.3-Second Hook Rule

Why 1.3 Seconds?

In 2025, attention spans have shortened to the point where you have just 1.3 seconds to stop the scroll and capture attention.

Hook Success Cascade

First 1.3 seconds: Scroll stop moment
     |
     v
First 3 seconds: 65% will watch 10+ seconds
     |
     v
First 3 seconds: 45% will watch 30+ seconds
     |
     v
Complete video: Algorithmic boost
     |
     v
Replay: Maximum algorithmic favor

Hook Framework

Second 1: Visual/Audio Grab

• Movement in frame
• Unexpected visual
• Pattern interrupt
• Strong audio cue

Second 2: Value Proposition

• What will viewer learn/feel?
• Clear benefit statement
• Curiosity amplification

Second 3: Curiosity Gap

• Open loop that demands closure
• Question that needs answering
• Promise of payoff

High-Performing Hook Types

YouTube Shorts Deep Dive

YouTube Shorts Algorithm

Key Signals:

• Watch time (primary)
• Click-through rate
• Engagement depth
• Subscriber conversion

Unique Advantage:

• Shorts feed long-form recommendations
• 41% faster channel growth with Shorts + long-form combo

YouTube Shorts Best Practices

Content Strategy:

• 55-second versions get 3x more views than 15-second
• Tease long-form content
• Thumbnail still matters for browse features
• CTA increases engagement by 22%

Technical Optimization:

• Title max 100 characters (keyword-rich)
• First frame = thumbnail in some views
• Add #Shorts in title or description
• Closed captions for accessibility

Monetization:

• Shorts Fund and ad revenue sharing
• Drive traffic to monetized long-form
• Build subscriber base for channel growth

YouTube Shorts CTA Strategy

Instagram Reels Deep Dive

Instagram Reels Algorithm (December 2025)

Key Signals:

• Topic clarity (emphasized in 2025 update)
• Engagement (saves, shares, comments)
• Watch time and completion
• Follows generated from Reel

Algorithm Preference:

• Clear, categorizable content
• Original content over reposts
• Consistent posting cadence

Instagram Reels Best Practices

The 3/8/12 Rule:

• 3 seconds: Hook and capture attention
• 8 seconds: Deepen interest and engagement
• 12+ seconds: Deliver full value

Content Strategy:

• 7-30 seconds for viral potential
• 30-90 seconds for optimal engagement
• 50% of viewers watch without sound
• Captions are non-negotiable

Technical Optimization:

• Trial Reels feature for risk-free testing
• Keyword-optimized captions (SEO shift)
• 3-5 highly relevant hashtags
• Best times: Tuesday-Thursday, 11 AM - 6 PM

Instagram Caption Optimization

Structure:

1. Hook line (before "more")
2. Value delivery
3. CTA
4. Hashtags (can be in comments)

Keyword Strategy:

• Instagram shifting from hashtags to keyword-based SEO
• Include relevant keywords naturally in caption
• Think "what would someone search for?"

Facebook Reels Deep Dive

Facebook Reels Algorithm

Key Signals:

• Shares (Facebook's core mechanic)
• Comments and reactions
• Watch time
• Cross-platform performance

Facebook Reels Best Practices

Content Strategy:

• Share-worthy content performs best
• Cross-post from Instagram when relevant
• Vertical video: 70% brand lift vs square
• Entertainment and utility content excel

Technical Optimization:

• 15-30 seconds optimal length
• 9:16 aspect ratio required
• Captions for sound-off viewing
• Best time: Late Friday night/midnight Saturday

Timing Critical:

• First 1-2 hours after posting determine reach
• Weekend posting shows higher views
• Test different times with your audience

Trending Audio Strategy

Why Audio Matters

• Algorithms favor content with trending audio
• Content with trending sounds gets wider distribution
• Early adoption of trending sounds = higher reach
• Audio mood alignment improves watch time

Finding Trending Audio

Audio Strategy Best Practices

Timing:

• Trending audio changes daily/weekly
• Jump on trends within 24-72 hours
• Use sound while it's rising, not peaked

Selection:

• Match audio mood to content tone
• Consider if lyrics support message
• Original sounds can create trends
• Licensed music for commercial use

Execution:

• Sync cuts to beat drops
• Match energy levels to music
• Use sound as hook element
• Consider sound-off alternative

Looping and Replay Optimization

Why Loops Matter

Short-form engagement weights:

Creating Seamless Loops

Technical Requirements:

• Last frame transitions to first frame
• Audio loops without break
• Story ends where it began
• No jarring cuts at endpoints

Content Strategies:

• Reveal then tease in same video
• Circular narratives
• Satisfying processes (art, cooking, ASMR)
• Unexpected endings that require rewatch

Loop Performance Stats

• 60%+ completion rate = good
• 80%+ completion rate = viral distribution
• Short 10-second loops pull 3x performance of long-form
• 5-10 second loopable clips perform well due to high replay

Caption and Subtitle Best Practices

Caption Impact

Caption Style Trends (2025)

Visual Styles:

• Animated, bouncing letters
• Liquid transitions between words
• 3D motion synchronized with music
• Highlighted key words with color/effects
• Word-by-word reveal timing

Technical Best Practices:

• Large, readable fonts (mobile-optimized)
• High contrast between text and background
• Position away from UI elements
• Match timing precisely to speech

Platform-Specific Caption Notes

Posting Schedule Optimization

Platform Best Times

Instagram:

• Best days: Tuesdays through Thursdays
• Peak times: 11 AM to 6 PM
• 1-2 Reels daily recommended

Facebook Reels:

• Late Friday night/midnight into Saturday = highest views
• First 1-2 hours after posting are critical

YouTube Shorts:

• 1-3 times daily for growth
• Consistent schedule matters more than perfect timing

Posting Strategy

Consistency Beats Perfection:

• Pick a sustainable schedule
• Build audience expectations
• Algorithm rewards consistent creators

Batch Content:

• Create multiple videos in single session
• Schedule ahead of time
• Maintain buffer for flexibility

Quick Reference Checklist

Pre-Publish Checklist

• Hook in first 1.3 seconds
• Correct aspect ratio (9:16)
• Optimal length for platform
• Captions/subtitles added
• Trending or appropriate audio
• 3-5 relevant hashtags
• Clear CTA included
• Loop potential considered
• Title/caption optimized
• Best posting time checked

Content Quality Checks

• Audio clear and balanced
• Visual quality high (1080p)
• Text readable on mobile
• No copyrighted content issues
• Engaging throughout (no filler)
• Value delivered as promised