On-line check-in giant, Foursquare has just passed 15 million users. This is milestone is huge for Foursquare, as they only had 1/3 of their current user base just one year ago.
With more than 90 million smartphone users in the US aged 13+, nearly 78% of smartphone users are potential geo-social app users. Facebook has made an attempt to enter into the mobile check-in market with Facebook Places; however, it has not seen the same results as Foursquare.
In an attempt to increase their market share, Facebook has acquired more technical employees for its California headquarters by buying Gowalla. Gowalla, based in Austin, Texas, will relocate the majority of its engineering staff to Palo Alto, CA to work on improving the mobile apps offered by Facebook.