David Karp did a presentation in Spain recently and reported some of the stats around the blogging service. Tumblr has over 2 million Tumblr bloggers, 40 million new posts per month, 420 million impressions, and 20 million visitors. On average Tumblr adds about 10,000 new people every day.
Tumblr has about 10 full-time employees. The company has about $5.25 million in funding. Karp said that they have about 2 years of runway left before running out of cash. Some of Tumblr’s users include John Legend, Katy Perry, etc. Tumblr has funding from Union Square Ventures, Betaworks, and Spark Capital.