For December 2007, MySpace.com received 72% of US visits among the social networking category, according to Hitwise. Facebook.com received 12.57% of visits and Bebo.com received 1.09% of visits. US traffic to all the social networking websites increased 4% YTY. MyYearbook experienced the largest gain in market share in December 2007, increasing 407% compared to December of the 2006. Facebook and Club Penguin followed, increasing 51 and 48%, respectively.
| Network | Domain | December 2007 | December 2006 | Growth, YTY |
| MySpace | www.myspace.com | 72.32% | 78.89% | -8% |
| www.facebook.com | 16.03% | 10.59% | 51% | |
| Bebo | www.bebo.com | 1.09% | 0.99% | 10% |
| BlackPlanet.com | www.blackplanet.com | 1.04% | 0.96% | 8% |
| Club Penguin | www.clubpenguin.com | 0.80% | 0.54% | 48% |
| Gaiaonline.com | www.gaiaonline.com | 0.76% | 0.58% | 31% |
| myYearbook | www.myyearbook.com | 0.73% | 0.14% | 407% |
| hi5 | www.hi5.com | 0.63% | 0.64% | -1% |
| Classmates | www.classmates.com | 0.55% | 0.58% | -7% |
| Yahoo! 360 | 360.yahoo.com | 0.54% | 0.91% | -40% |