Study: Facebook use soared in 2009 – U.S. members more than doubled

Some staggering numbers about the growth of Facebook, compliments of the online measurement firm, comScore. From December 2008 to December 2009, Facebook more than doubled its U.S. audience from 54.5 million visitors to 111.9 million, according to a comScore blog post. Based on those numbers, Facebook jumped from the No. 11 U.S. Web property to No. 4, behind only Google, Yahoo, and Microsoft. “In other words, more people are using Facebook more frequently to the point that the site accounts for thr…