[catlikesshrimp]

That was a troll feature. It usually showed any user his own information.

MAYBE some forum doxxed users by posting their informatio? but I didn't see any.

[giancarlostoro]

My friend would figure out the username, but he never did it maliciously, just for the challenge. Forums would show you which user was viewing a thread...

[iforgot22]

Wikipedia still does if you aren't logged in