Microsoft edged out Yahoo in January again to become the second largest Web property behind Google, according to the latest data from comScore. Unique visitors to Microsoft sites including MSN surpassed 179 million last month, about 2 million ahead of Yahoo’s total traffic. Google was No. 1 with more than 187 million visitors. Rounding out the top five were Facebook (163.5 million) and Amazon (110 million).
The comScore report also underscored the growing popularity of virtual bulletin board Pinterest, which was the third fastest-growing site in January behind IRS.gov and ED.gov (U.S. Department of Education).
Google Ad Network led the January Ad Focus ranking with a reach of 92.9 percent of Americans online, followed by AOL Advertising (85%), Yahoo! Network Plus (84.8%), ShareThis (82.4%) and AT&T AdWorks (82.3%).