Chris, are you looking for twitter integration into the contact conversation threading like SMS etceteras?

I'm not a MySpace user so forgive the daft question but does that also have postings to your page that you would want to keep track of in a similar manner?

If these two are as you meant then I would suspect the Telepathy library would be the best place to get such an extension and then it should just integrate in the same manner. Maybe post a brainstorm for the functionality and I'm sure it should be fairly simple to integrate. I'm also assuming you'd be happy to help test the MySpace integration? From a developer perspective though I would suggest a seperate post for each source though to enable at least one to be picked up.