Facebook users just don't seem to be as young as they used to be. And they're going to the social-networking site a lot more often.
A new report from traffic tracker Hitwise shows that U.S. visits to Facebook grew 149 percent in February compared with the same month a year earlier. That pushed Facebook's market share among folks in the United States visiting social-networking Web sites to 36 percent last month, versus 14 percent in February 2008.
Facebook stayed in second place, but it's gaining ground against the No. 1 site. In February, MySpace accounted … Read more