The online book community BookRix announced today that SocialBook is now in beta testing. SocialBook allows writers anywhere in the world to work together to build an eBook. They can contribute from either their Facebook, Twitter or BookRix profiles, simply by connecting their accounts and including a specified #hashtag.

SocialBook is free for all BookRix members, and they can use it for just about any group project. For example, it could be used as a platform for schools projects, or several users could collaborate on a cookbook.