"In the first month of 2010 ... Facebook’s traffic rose to 133.62 million visitors"
http://mashable.com/2010/02/17/facebook-unseats-yahoo/
"More than 400 million active users" http://www.facebook.com/press/info.php?statistics
"More than 400 million active users" http://www.facebook.com/press/info.php?statistics
For Tipjoy, Compete tracked each site that had our javascript or iframe. So any widget company is being extremely over counted.