Posterous, a blogging platform very similar to Tumblr, was acquired by Twitter earlier today.

It was an interesting move, I think, for several reasons. (Disclaimer: I used to host this blog over on Posterous,  but switched several months back, after several service disruptions.)

Why do YOU think Twitter acquired Posterous? Was it:

a) a talent grab, ‘nuff said. The Posterous founders are geniuses, and Twitter’s lucky to have ‘em.

b) the continuation of Twitter’s move into expanded brand pages. (We’re already starting to see expanded tweets and other content on the new Twitter brand pages)

C) This reason.