After being basically kicked off of the internet by Google, Andreessen Horowitz's $15 million golden child, is as popular in the new year as it was in the summer of 2011.

Since Yahoo! decided to buy itself many million cool, popular teens, we've been wondering just how much the billion dollar purchase is working out. Are they clicking ads? And more importantly, just how popular did Tumblr make its historically square parent company? It was murky before, and now they're making it even more opaque.