Some data from my company, the latest information on social networks. Enjoy.
NIELSEN ONLINE PROVIDES TOP U.S. SOCIAL NETWORKING SITES AND BLOGS FOR APRIL 2008
Nielsen Online provides April's top U.S. social networking sites and blogs for your reference. They are ranked by unique audience and rounded to the nearest thousand, so LinkedIn had 8.7 million unique visitors in April 2008, growing 361 percent over April 2007.
Please note that these are custom lists compiled by the Nielsen Online PR team with the help of our media analysts. While these lists are not meant to be exhaustive, they provide a good idea of the significant players in each space.
We periodically review the lists and add new sites, so the results may change accordingly. Please source data to Nielsen Online.