Social media site Posterous will shutdown its services and mobile apps in order to focus entirely on Twitter. They've provided a backup tool and instructions on how to migrate to another site.
Posterous RSS
In a somewhat surprising move, Posterous has today announced that they have been acquired by Twitter, in what appears to be a move to acquire Posterous' talent rather than technology.
Micro-blogging platform Posterous has secured a considerable amount of funding via numerous investors, after its most recent redesign.