We hear that Facebook has purchased Social.im, the instant messaging application built on top of Facebook. This jibes with Michael Arrington's report that Facebook is about to launch an IM service. Mogad, the company behind Social.im, also took investment from Facebook backer Peter Thiel. Update: "If we're being bought, I haven't gotten the call yet," says Mogad CEO Yanda Erlich. In a now-deleted blog post, he also poked coy fun at the now-debunked rumor with this fake IM exchange: