HumanDefender

5-signal behavioral AI that Ghost Scores every comment — automatically.

Mods decide. HumanDefender informs.

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The Problem

Reddit's mod queues are overwhelmed. Bot networks and coordinated inauthentic behavior (CIB) campaigns operate at machine speed — spinning up accounts, farming karma, and flooding subreddits with astroturfed content before human mods can react.

HumanDefender catches them on the first comment.

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How It Works

Every comment triggers an automatic analysis using 5 behavioral signals, producing a Ghost Score (0–100). High-scoring accounts receive automatic mod notes. Ghost-tier accounts (81+) are auto-reported to the mod queue with zero mod intervention.

The 5 Signals

Signal	Points	What It Catches
🔴 Karma Ratio	25 pts	95%+ comment-only karma — the bot fingerprint
🟠 Velocity Index	20 pts	Metronomic posting rhythm — bots don't sleep
🔴 Linguistic Entropy	25 pts	Template language & low vocab diversity
🟠 Cross-Sub Scatter	15 pts	Carpet-bombing unrelated subs — astroturfing signature
🔴 Reply-Only Flag	15 pts	Never starts threads — pure amplification behavior

Ghost Score Verdicts

Score	Verdict	Automatic Action
0–30	✅ CLEAN	No action
31–60	⚠️ SUSPICIOUS	Logged
61–80	🤖 LIKELY BOT	Mod note added
81–100	👻 GHOST	Mod note + auto-report to queue

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Screenshots

Ghost Score card — 89/100, auto-reported	Detection log — last flagged accounts
Smoke test suite — 10/10 passing	Stats dashboard — full detection breakdown

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Architecture

Reddit Comment
  └─→ Devvit CommentSubmit Trigger
        ├─→ Local signals (Karma Ratio + Velocity + Reply-Only)
        └─→ CF Edge Worker (Linguistic Entropy + Cross-Sub Scatter)
              └─→ Composite Ghost Score
                    ├─→ Mod Note (61+)
                    ├─→ Auto-Report (81+)
                    └─→ Detection Log (all)

Devvit App (TypeScript)

• CommentSubmit event trigger — zero setup, fires on every comment
• Redis-backed rolling detection log (500 entries per subreddit)
• Full structured logging: level, event type, timing, signal breakdown
• 10-test smoke test suite accessible from the mod menu

Cloudflare Edge Worker (ghosthunter.osintnet.uk)

• Handles compute-intensive signals: Linguistic Entropy + Cross-Sub Scatter
• Shannon entropy analysis on token distributions
• Cross-subreddit burst window detection
• Sub-100ms global response time with graceful degradation

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Mod Tools Menu

Access via the subreddit mod menu:

Menu Item	What It Does
🔍 Score this account	Manually score any commenter
📋 Detection Log	Last 500 flagged accounts
📊 Stats	Total / Ghost / Bot / Suspicious / Clean counts
🔴 Error Log	Full observability — every event
🧪 Run Smoke Tests	10 automated tests verify the full system

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Installation

1. Go to developers.reddit.com/apps/humandefender
2. Click Install
3. Select your subreddit
4. Done — HumanDefender starts scoring immediately, zero configuration required

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Privacy & Safety

• Only reads publicly available Reddit data
• Never stores comment content — behavioral analysis only
• No personal data, no content classification
• Mods always make the final call — no auto-bans, no auto-removals

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Changelog

v0.0.4 — May 9, 2026

• App icon and portal description added
• README with full documentation and screenshots

v0.0.3 — May 9, 2026

• 5-signal Ghost Score engine complete
• Edge worker (Linguistic Entropy + Cross-Sub Scatter)
• 10-test smoke suite
• Stats dashboard + detection log + error log

v0.0.2 — May 9, 2026

• CommentSubmit trigger live
• Karma Ratio, Velocity Index, Reply-Only signals
• Mod note + auto-report at Ghost tier

v0.0.1 — May 9, 2026

• Initial scaffold

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Built By

Indica Independent Media / VPDLNY
Vulnerable Persons Defense League of New York

We build open-source information tools for vulnerable communities and internet safety. All tools are free at point of use.

"Information as the weapon. Knowledge as the shield."

🔗 GitHub | App Portal | r/humandefender_dev