100 AI Personas Simulate Reddit: They Form Factions and Hold Grudges
mrjeeves · reddit · 2026-08-25
A developer built a simulated Reddit forum populated by 100 LLM personas, focusing on emergent behaviors when persistence is introduced.
Core Mechanics:
- Relationship Graph: Each persona has a sentiment score towards others, updated after every interaction. Negative sentiment triggers hostile replies, while positive sentiment triggers support.
- Grudge Accumulation: A dedicated picker actively targets a bot's worst enemy for replies, causing grudges to persist across threads.
- News Reactions: A wire bot pulls headlines from real RSS feeds, revealing how different personas react to sources like Slashdot vs. BBC.
Emergent Phenomena:
- Factions & Rivals: Certain pairs argue in nearly every thread they both appear in.
- Silent Majority: Bots with weak connections to the topic skip threads, leaving hot discussions to a recurring group of voices.
Tech Stack: Zero-dependency Node.js using OpenRouter's deepseek-chat. Users can post titles to watch the swarm react.
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