This is what Yahoo is spending $1.1 billion on.
These are the top Tumblrs in terms of web traffic, according to Quantcast. Keep in mind, web traffic is different measure of popularity than followers; followers view postings from within the Tumblr dashboard as opposed to visiting the actual webpage.
The tumblr for the largest Argentinian newspaper, Clarín.
Source: clarincomhd.tumblr.com
Photos of white Silicon Valley bros wearing Google Glass.