Agent Skills: Platform Algorithms Deep Dive (2025-2026)

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 (/).

Platform Algorithms Deep Dive (2025-2026)

Complete guide to understanding and optimizing for TikTok, YouTube, Instagram, and Facebook algorithms.

Algorithm Fundamentals

How Social Algorithms Work

All major platforms use similar principles:

1. Content Analysis: What is the video about?
2. User Signals: How do viewers interact?
3. Creator Signals: Creator history and behavior
4. Distribution: Who should see this content?
5. Feedback Loop: Performance adjusts distribution

Universal Algorithm Truths

Platforms Want:

• Users to stay on platform longer
• High engagement (interactions)
• Quality content that satisfies users
• Diverse content discovery

What Drives Distribution:

• Watch time (how long people watch)
• Engagement depth (comments > likes)
• Completion rates (especially for short-form)
• Sharing behavior
• Return visits

TikTok Algorithm (2025)

Algorithm Signals

| Signal | Weight | Description | |--------|--------|-------------| | Watch Time | Highest | Total seconds watched | | Completion Rate | Very High | % of video watched | | Replays | High | Video watched multiple times | | Shares | High | Direct shares to others | | Comments | Medium-High | Written engagement | | Follows | Medium | New followers from video | | Likes | Lower (2025) | Heart button taps |

2025 Update: Shallow interactions (likes) have reduced weight compared to deeper signals like watch time and replays.

TikTok's Cold Start System

How New Videos Are Tested:

1. Video published
2. Shown to 200-500 initial viewers
3. Performance measured against benchmarks
4. Strong performance = expanded distribution
5. Weak performance = limited to followers

Cold Start Success Factors:

• First 3 seconds retention
• Completion rate vs video length
• Early engagement velocity
• Replay rate

TikTok Content Preferences

Algorithm Favors:

• Family-friendly content
• Positive emotional tone
• Educational value
• Authentic creator content
• Micro-niche targeting
• Trending sound usage

Algorithm Deprioritizes:

• Controversial/negative content
• Duplicated content
• Low-quality production
• Misleading thumbnails
• Watermarked content from other platforms

Micro-Niche Prioritization

2025 Algorithm Change: TikTok now heavily favors micro-niche over broad appeal.

Benefits:

• Specialized content sees 2.5x better distribution
• Algorithm micro-categorizes: "beginner leg workouts for women" vs just "fitness"
• Niche authority = more algorithm push for new content

Strategy:

• Define specific niche clearly
• Use niche-specific language and hashtags
• Build authority in one area before expanding
• Let algorithm understand your content category

TikTok For You Page (FYP)

How Videos Reach FYP:

1. Initial Test: Small audience batch
2. Performance Check: Engagement metrics evaluated
3. Expanded Test: Larger audience if metrics strong
4. FYP Placement: Continued performance = broader FYP reach
5. Ongoing: Performance at each level determines next reach

FYP Success Factors:

• Hook in first 1.3 seconds
• High completion rate
• Strong replay rate
• Trending sound usage
• Relevant hashtags

TikTok Hashtag Strategy

| Hashtag Type | Purpose | Examples | |--------------|---------|----------| | Broad/Trending | Reach attempt | #fyp, #viral | | Category | Topic discovery | #fitness, #cooking | | Niche | Targeted audience | #beginneryoga, #airfryer | | Branded | Campaign tracking | #YourBrandChallenge |

Optimal Strategy:

• 3-5 hashtags per video
• Mix of niche and category
• Quality over quantity
• Trending hashtags increase engagement 23%

TikTok Posting Schedule

| Metric | Value | |--------|-------| | Recommended frequency | 1-4 times daily | | Views in first 24 hours | 68% | | Peak window improvement | 30% better results | | Growth with 2-4x daily | 2.5x higher follower growth |

YouTube Algorithm (2025)

Long-Form Algorithm Signals

| Signal | Weight | Description | |--------|--------|-------------| | Watch Time | Highest | Total minutes watched | | Audience Retention | Very High | % of video watched | | Click-Through Rate | Very High | Clicks / Impressions | | Session Time | High | Time viewer stays on YouTube | | Engagement | Medium | Likes, comments, shares | | Subscriber Actions | Medium | New subs, bell clicks |

YouTube Shorts Algorithm

| Signal | Weight | Description | |--------|--------|-------------| | Watch Time | Highest | Per-video and cumulative | | Completion Rate | Very High | Essential for short-form | | Engagement | High | All interaction types | | Swipe-Away Rate | High | Inverse signal (lower = better) |

Shorts + Long-Form Connection:

• Shorts help identify resonant audiences
• Algorithm recommends long-form to Shorts viewers
• Combined strategy = 41% faster channel growth

YouTube Discovery Mechanism

Where Videos Are Discovered:

| Source | Description | |--------|-------------| | Home Feed | Personalized recommendations | | Search | Keyword-based discovery | | Suggested | After/alongside other videos | | Browse Features | Trending, playlists | | Notifications | Subscriber alerts | | External | Google search, social shares |

YouTube SEO Signals

Ranking Factors:

| Factor | Importance | |--------|------------| | Watch time | Most important | | Click-through rate | Very important | | Engagement | Important | | Keywords (title, description) | Important | | Closed captions | 94% of top videos have them | | Video length | 8-9 minutes best for search |

SEO Statistics:

• 25%+ of Google searches include video snippets
• Videos can get 2-5x more views from Google ranking
• Top-ranking videos average 29 months in age

YouTube Posting Schedule

| Day | Best Time | Notes | |-----|-----------|-------| | Tuesday | 6-9 PM | Peak performance | | Wednesday | 6-9 PM | Peak performance | | All weekdays | 12-3 PM | Good secondary window | | Friday-Saturday | Afternoon | Broader engagement window |

YouTube Algorithm Optimization

Key Strategies:

1. Maximize Watch Time

   • Front-load value
   • Eliminate dead time
   • Use pattern interrupts

2. Optimize CTR

   • Test thumbnails (up to 3 variants)
   • Compelling titles
   • Curiosity without clickbait

3. Increase Session Time

   • End screens with relevant videos
   • Playlist optimization
   • Content series

Instagram Algorithm (2025-2026)

Instagram Reels Algorithm

| Signal | Weight | Description | |--------|--------|-------------| | Topic Clarity | Very High | Clear content categorization | | Engagement | High | Saves, shares, comments, likes | | Watch Time | High | Duration viewed | | Follows from Reel | High | Audience growth signal | | Audio Usage | Medium | Trending audio preference |

December 2025 Algorithm Update

Key Change: Topic Clarity Emphasis

Instagram now prioritizes content that can be clearly categorized by topic.

Impact:

• Clear niche content gets better distribution
• Mixed-topic creators may see reduced reach
• Keyword optimization becoming more important

The 3/8/12 Rule

Instagram's content evaluation framework:

| Time | Checkpoint | Algorithm Action | |------|------------|------------------| | 3 seconds | Hook evaluation | Continue or abandon | | 8 seconds | Interest deepening | Engagement prediction | | 12+ seconds | Value delivery | Distribution decision |

Instagram Trial Reels

New Feature (2025): Test content without risking engagement metrics.

Benefits:

• Risk-free experimentation
• No negative impact on feed
• Learn what works before full publish
• Test hooks, formats, topics

Instagram Hashtag Evolution

2025 Shift: Instagram moving from hashtags to keyword-based SEO.

New Strategy:

• Focus on keywords in caption
• Reduce hashtag quantity (3-5 vs 30)
• Posts with at least one hashtag: 12.6% more engagement
• Think "what would someone search for?"

Instagram Posting Schedule

| Day | Best Time | Notes | |-----|-----------|-------| | Tuesday | 11 AM - 6 PM | Peak engagement | | Wednesday | 11 AM - 6 PM | Peak engagement | | Thursday | 11 AM - 6 PM | Peak engagement |

Best Practices:

• Consistency matters more than perfect timing
• 1-2 Reels daily recommended
• Test different times with your audience

Facebook Reels, Platform Comparison & Optimization Framework

Detailed Facebook Reels algorithm notes, cross-platform comparison matrix, algorithm optimization framework, and upcoming changes to watch live in references/facebook-comparison-optimization.md. Load that reference when comparing platform tradeoffs or adapting one asset across multiple algorithms.

Quick Reference

Algorithm Success Checklist

TikTok:

• [ ] Hook in 1.3 seconds
• [ ] Trending or appropriate sound
• [ ] 3-5 relevant hashtags
• [ ] Clear niche focus
• [ ] High completion potential

YouTube:

• [ ] Compelling thumbnail (test 3 variants)
• [ ] Keyword-optimized title/description
• [ ] Strong hook (5-10 seconds)
• [ ] Closed captions included
• [ ] End screens/cards configured

Instagram:

• [ ] Clear topic/niche
• [ ] 3/8/12 structure
• [ ] Keyword-rich caption
• [ ] 3-5 relevant hashtags
• [ ] Sound-off friendly (captions)

Facebook:

• [ ] Share-worthy content
• [ ] Conversation starters
• [ ] Vertical format (9:16)
• [ ] Weekend timing considered
• [ ] Native upload (not cross-posted link)