In a somewhat expected move, Posterous today announced that they have been bought by Twitter. The company statements make it look like Twitter is looking to grab the talent at Posterous, to help them work “on several key initiatives that will make Twitter even better.”

Posterous, a company started in 2008, is not necessarily seen playing in the same space as Twitter, and is not necessarily seen as a micro-blogging service like Twitter. While very simple in design, users are still free to blog longer posts, despite also being referred to as a microblogging platform. But Posterous is very much focussed on people blogging from their mobile phones, very much like Twitter. Posterous is known for the many ways a user can blog while on the move, so it might be something Twitter is looking at, despite Twitter becoming quite ubiquitous across new phones.

Posterous founder Sachin Argawal had the following statement: “The opportunities in front of Twitter are exciting, and we couldn’t be happier about bringing our team’s expertise to a product that reaches hundreds of millions of users around the globe. Plus, the people at Twitter are genuinely nice folks who share our vision for making sharing simpler.”

Existing Posterous users can keep using their accounts, and they will receive “ample notice” if they should expect any changes. The biggest question now is rather what Twitter is planning – could it mean an alternative platform for people who want to tweet longer messages?

What do you think Twitter stands to gain from their Posterous purchase?