Hmm, I just tired to fire up Tweetdeck and got a warning from FSIS 2012 flagging Tweekdeck.exe as Trojan.Generic.699620. I've been using Tweetdeck for months, so assuming this is a false possitive?
Please submit the file to analysis.f-secure.com as possible false positive. Create an account first and ask for feedback in the comment. Please post the ticket ID here.