This had better be a bug (I assume it is though other TC staffers aren't so sure). If not, this is perhaps the worst UI change I've ever seen. I refuse to believe that Twitter is really trying to add your DM inbox/sent messages, and all those new retweet categories to the main stream like that. Unless they read my post the other day and decided to do the opposite. And what on Earth is up with those numbers? Why the hell do I need numbered tweets in my stream, this is not Sesame Street.