Ah, I see. idkfa must have been amongst the recovered data.

As for tagging, that's... possible? I guess? I assume you want to do so in order to notify people that you're mentioning them in a post. In that case, there is a "any time anyone mentions your name" post on the "More..." portion of the my idkfa menu, but few people use it. Given our low post count, and our read/unread feature, if somebody is keeping up with their stuff, they'll usually come across a post eventually.