Seesmic might have the sweetest Twitter app for Blackberry, but the Blackberry's appeal isn't sweet enough. Seesmic is discontinuing support for its Blackberry app on June 30. Research in Motion, the company that makes the Blackberry, is going through a rough spot right now. But things must be pretty bad if Seesmic bailing. This is Seesmic , folks! They'll build an app for any platform, even Windows Phone 7 .