Nope. Twitter's business model should be to tend to the platform and create the eco-system around it that creates value for both the 3rd parties AND twitter.

Nope. Twitter's business model should be to tend to the platform and create the eco-system around it that creates value for both the 3rd parties AND twitter. If twitter acquires a participant in the ecosystem, that vertical is essentially locked up because how can a third party compete directly with twitter? Search is the obvious example because it has happened (Summize). While it is true Twitter is creating accounts for business, they are not going to be offering the kind of functionality CoTweet and others offer.