Tumblr hosts 100 million blogs

"Tumblr has today quietly ticked over the 100 million blog mark, with those blogs containing some 44.6 billion posts. We noticed that the ticker on the popular blogging platform’s about page had ticked over and Tumblr confirmed with us that this milestone was reached today.
This marks significant growth over the last year, of somewhere around 50 million blogs since April of 2012, when it crossed 50 million for the first time. The last reported number of blogs was 93 million as of March 2, 2013, so the pace is still accelerating, with 6 million being created in the last month or so alone."

Source:  The Next Web, 26th March 2013