It's the employee base twitter seems to be interested in. It cannot go with tweetdeck UI given it has already finalized on how it wants people to see twitter (w

It's the employee base twitter seems to be interested in. It cannot go with tweetdeck UI given it has already finalized on how it wants people to see twitter (with tweetie acquisition). Another reason can be deck.ly. That is something which twitter does not have at this point.