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https://euzicasa.wordpress.com/2013/03/28/ljs-infodocket-%e2%80%8finfodocket-4m-social-media-milestone-tumblr-hits-the-100-million-blog-mark/
LJ's infoDOCKET ‏@infodocket 4m Social Media Milestone: Tumblr Hits the 100 Million Blog Mark