Mashable has announced the launch of MashDeck, a strangely familiar looking Twitter app using Adobe Air. You recognize it because it is basically TweetDeck, the popular Twitter app, rebranded for Mashable, which basically means some minor design tweaks (for the worse if you ask me), and a default Mashable search column. TweetDeck previously did a Blink-182 branded version, so maybe ReadWriteWeb is onto something here: Is this the business model?