Super-simple blogging service Tumblr today launched the Tumblr Directory, a way to find popular members of the Tumblr community.
The launch follows the recent introduction of “Tumblarity”, a ranking method determined by a secret formula involving the number of followers you have, the number of posts you’ve made, the number of times someone has “liked” your posts, and the number of times you’ve been reblogged. As such, it’s a bit more complex than, say, ranking Twitter users based on the number of followers they have: it’s more akin to ranking them based on retweets.