In the continuing saga of MySpace vs. third-parties-who-want-to-make-a-buck, MySpace recently blocked Revver. TechCrunch got MySpace PR to explain why it happened.
If a widget violates our TOS, we block them. Breaches would include any person, widget or software that violates copyright, poses security risks, distributes pornography or engages in commercial activity. Commercial activity includes selling ads on a MySpace page through their widget or software.
Clearly, MySpace has the right to shut them down, given their terms of service agreements. The more interesting question is the stance that the company will take in the long run with respect to the openness of their pages. Much of their success was built upon the user experience third party plug-ins/widgets provided. Now that they are big, perhaps they think they don’t need the help anymore? That would be a short-sighted stance. The Web is a big and varied place. Walled properties don’t have a history of doing well.
Source: MySpace: Why We Block Widgets