Facebook Attracts 75% of U.S. Social Networking Visitors

Recent data from comScore shows that social networks received over 200 million unique U.S. visitors in April 2011, and ~151 million of these visitors (three out of four) use Facebook.

Overall unique visitors to social networks rose 61% from two years ago, while visits to Facebook rose an impressive 332% over that same time period (from 35 million visitors per month back in April 2008).

Will Facebook continue to attract the lion’s share of visitors to social networking sites?  Could it eventually edge all competitors out?