Earlier this month Forrester Research announced that only 6% of U.S. mobile phone owners use a location based application although that figure is up 3x from 2% in 2010 (coincidentally Foursquare announced the day prior that their user base had grown 3x from 2010 to 15 million). That said the word is clearly getting out among mobile users. A year ago only 16% of online adults said that they were familiar with apps such as Foursquare, Gowalla, or Loopt. That number has grown 87.5% over 12 months to 30% in 2011. Obviously this space represents a significant opportunity for growth which is not lost on companies and investors alike as investment dollars continue to flood the geo-social industry segment.