Facebook has felled another Internet giant, surpassing Yahoo in January to become the second most visited website in the US. In December, Facebook had 132.1 million unique visitors to Yahoo’s 133.4 million. But last month the tables were turned, Mashable reports, with Facebook garnering 133.6 million unique visitors to Yahoo’s 132.0 million. The top spot, of course, belongs to Google. (More Facebook stories.)