While viewing another user's profile page, I saw I apparently have the ability to add favorite or ignored tags for them:
(Parts blacked out for privacy reasons.)
I didn't attempt to add any tags, so I'm not sure whether it would actually work; either way, I shouldn't be seeing this.
Edit: I'm also seeing the following on the "accounts" tab:
I know that was a problem before on another site, but I thought it was fixed!