But according to data provided exclusively to The Daily from tweetcongress.org, a nonprofit website that captures each member of Congress’s Twitter feeds in real time, the shot seen round the world was transmitted using TweetDeck — a popular Adobe desktop application that links up with social networking sites. A review of Weiner’s Twitter stream from May 27, the day of the crotch pic, shows that Weiner had been posting only from TweetDeck — one of many ways to post messages to Twitter — that entire night.

Chet Wisniewski, a senior security adviser at security software company SophosLabs, said the TweetDeck stamp “does make it more plausible that it did come from him.”

Weiner used TweetDeck frequently, but he often also posted from the Web directly or from his BlackBerry. A widely circulated explanation for how Weiner’s Twitter account could have been hacked by email would also seem to be incompatible with the fact that the message in question originated on TweetDeck. If email had been used, the message probably would have originated via the photosharing site Yfrog, where the infamous picture was posted.