Twitter on Monday announced that it has bought mobile blogging startup Posterous. Twitter said that the Posterous site will continue up and running without any interruption. Terms were not disclosed. Posterous engineers, product managers and others will join Twitter’s teams working on several key initiatives.

San Francisco based Posterous launched in 2008 as a platform for blogging with an emphasis on letting people use smartphones to post pictures, videos, audio or other digital snippets and share them with groups in virtual “Spaces.”

Here is the text of Twitter’s post on the deal:

Today we are welcoming a very talented group from Posterous to Twitter. This team has built an innovative product that makes sharing across the web and mobile devices simple—a goal we share. Posterous engineers, product managers and others will join our teams working on several key initiatives that will make Twitter even better.

Posterous Spaces will remain up and running without disruption. We’ll give users ample notice if we make any changes to the service. For users who would like to back up their content or move to another service, we’ll share clear instructions for doing so in the coming weeks.

We’re always looking for talented people who have the passion and personality to join Twitter. Acquisitions have given us people and technology that have enabled us to more quickly build a better Twitter for you.

“The opportunities in front of Twitter are exciting,” Posterous founder and chief executive Sachin Agarwal said in a message.

To be honest, I think it’s for the better.