Facebook roundup: Nielsen report, site governance, Blackberry app and more

Nielsen reports stats on Facebook’s dominance in U.S. – Facebook continues its reign as the most-visited social network in the U.S., according to Nielsen. The service has an estimated 152.2 million visitors via PC, 78.4 million mobile app users and 74.3 million mobile web visitors in the U.S. This is multiple times the size of the next largest social sites across each platform. Facebook is also the top U.S. web brand when it comes to time spent on site.