Everything below works on a private account while logged out, because it lives outside the
account's privacy wall. This is public data, legally observable. It does not include the follower
list, posts, DMs, or engagement metrics — those are server-side and unreachable.
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Reading the results honestly
Real signal — who she comments on, who tags her, mutual follows, profile-picture changes, and the follower count moving. These are observable and repeatable.
Weak signal — bios, usernames, avatars. Easy to interpret wrongly; don't build a case on them.
Not obtainable, ever — follower identities, post contents, likes, comments, DM data, online status, IP addresses. No tool, site, or bot reaches these from outside.
A follower count that jumps by one shortly after a Facebook list does the same is worth noting on a timeline. Two independent platforms moving together is stronger than either alone.
Do not reuse an existing password, and don't feed these handles to any "viewer" site — that traffic pattern is exactly what credential-harvesting farms look for.