| http://www.w3.org/ns/prov#value | - Blogger is the largest of these sites with more than 46 million unique U.S. visitors during October 2011, making it second only to Facebook in the social networking category tumblr.com counts 38,884,272 total blogs with 53,399,798 posts on the 29 th of December while in July 2009 the number of posts per day was 650,000 facebook or microblogging sites such as Twitter have supported the growth of bl
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