I highlighted their difference with Tumblr here not too long ago: http://news.ycombinator.com/item?id=3809374
They both use Quantcast, so the numbers have to be pretty accurate.
They both use Quantcast, so the numbers have to be pretty accurate.
Mullenweg has said before he pictures Tumblr as more of a social network than a blogging platform. I wish I could find that right now. Either way, WordPress.com is definitely learning some things from Tumblr. The new wp.com dashboard and quick posting mechanism is enough proof of that.