What gets checked
- Replies from one person directly to the other, and replies inside the other's threads
- Quote posts and @-mentions
- Likes and reposts of each other's posts
- Whether each follows the other, and since when
Everything comes from public AT Protocol data, read directly from each person's own data server. No sign-in, and nothing leaves your browser except those public lookups. Example accounts are filled in; replace them with any two handles.