According to a recent report by comScore, The 2007 U.S. Internet Year in Review, the top-gaining internet properties in the past year have included social media giants Facebook and Wikipedia. The number of Facebook users grew by 81%, while Wikipedia site visitors experienced a 31% increase. Craigslist.org also represented a top-growing property, with a 74% rise in visitors in the past year.
Source: MediaPost Research Brief, February 6, 2008