Tumblr now hosts more blogs than WordPress
From Mashable:
In January, Tumblr had more than 7 million individual blogs. At the time Mashable posted this article, the total blog ticker on the site read about three times that at 20,873,182 — beating out WordPress.com’s current count of 20,787,904 by about 85,000 blogs.
Hear the Coatster (that’s Tumblr’s Mark Coatney) talk about this on NPR