Google Inc. has bought social games start-up SocialDeck Inc., the latest in a series of acquisitions aimed at helping the Internet search giant build a social-networking service to compete with Facebook Inc.

source: wall street Journal

The social networking space is dominated by major players like face book and twitter. Google should build a social networking service with some additional unique features, something that sets it apart from it's competitors, a competitive advantage. Google recently dropped Google Wave and buzz doesn't perform well in the market as expected. Google is yet to set it's strong foot on the social networking space. This is another attempt by Google to establish it's strong presence in the social networking space.