"It turns out that we broke our Quantcast tracking code a few weeks ago and were no longer reporting any impressions past page one of the Dashboard." With the new data, Tumblr is now one of the top 25 sites in the U.S. according to the data Quancast tracks. According to Siegler, Karp credits international growth and faster response times to Tumblr's amazing trajectory.
Says Maloney: "Tumblr's growth the last few months has been remarkable, overshadowing everything in the past. It's coming from all over the globe and across all demos, in particular teenagers." Meanwhile, both Karp and Maloney credit the Tumblr engineering team, which has been handling the load after downtime problems earlier in the year.