Digg Linkedin PageRank Wikipedia 
WebMarketCentral
MARCH 10, 2009
Site Alexa Rank (March 2009) Compete Traffic (February 2009) Compete 1-Year Traffic Change Google Pagerank Facebook 5 73,787,766 +159.0% 8 LinkedIn 14 11,246,726 +137.4% Site Alexa Rank (March 2009) Compete Traffic (February 2009) Compete 1-Year Traffic Change Google Pagerank Facebook 5 73,787,766 +159.0%
WebMarketCentral
JANUARY 7, 2008
Wikipedia lists more than 100 social networking sites , and Social Media Trader recently compiled an even more exhaustive list of 115 social news and bookmark sites rated by PageRank, number of inbound links and dollar value of each site. Later, I wrote about a couple more , and newer sites such as Twitter keep popping up.
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