Twitr plays is dangerous with such a close name to Twitter. But they are a user directory based around hashtags. You are able to add yourself, utilizing oAuth to give access to your user profile information, and assign three tags that best describe you.
After it processes you, a profile page is brought up that draws in your Twitter avatar, bio, latest status and a small graph of follower count. There is a lowr section for TopURLs, but I did not see any information there.
A mobile site is available and the homepage includes links to tags and top users. They need to include some advanced searching to search across tags and people since it is supposed to be a directory. heck, any kind of search would have been nice.