Tumblr has gained a lot of new users and readers over the past year, and it also has a big fan in Google. (And possibly Bing, for that matter.)
According to comScore, Tumblr saw a 100.5 percent rise in unique visitors between July 2011 and July 2012, reaching 26.9 million uniques in July.
Those are desktop visits, and smartphone traffic is also up. ComScore says Tumblr had 6.7 million smartphone visitors in July, a 51 percent gain over only five months.