The problem isn't that he posts in twitter or that twitter isn't taken away from him. He is a good football player, but he's hindered by a lack of mental fortitude. In the past players were shielded from this, but given the podium of twitter, he's able to broadcast his inability to cope with the mental stress of the game to all of the fans. I'm ok with him being drafted where he was, I dislike Donte because while he hypes a lot, he lacks the discipline to control himself.
These latest twitter escapades have defined his shortcoming as a football player. He can't put other things out of his mind and play ball. This fits in with Buddy's comment about players who have played in big games and aren't phased. There's a lot of talk about his 'passion' and team loyalty, but he's going to go to another team and say all kinds of wonderful things and make all the same promises he made here. Then he's going to have a bad game and a fan is going to say something and he's going to be unable to right the ship.
It's a more mild case of Vince Young syndrome.