Methodology

Parallel HTTP requests to 25 platform APIs and public profile endpoints — 8s timeout per platform

Covered: GitHub, Reddit, HackerNews, Gravatar, npm, PyPI, Keybase, Mastodon, Lichess, Chess.com

Also: Twitch, Telegram, Steam, Pastebin, GitLab, Codepen, Replit, Linktree, About.me, Spotify, SoundCloud

Platforms requiring login (Twitter, Instagram, TikTok, Facebook) — direct profile links provided

False positives: some platforms return 200 for all usernames — verified with content-based checks

For comprehensive coverage: use Namechk (500+ platforms) or Sherlock (CLI tool)