My friend Adam Rifkin, who runs the awesome PandaWhale (where I get a ton of my news), recently wrote about the Tumblr acquisition for AllThingsD.  It’s a smart and well-reasoned essay, which is well worth reading: http://dthin.gs/113xmz8 His basic argument is that Tumble is valuable because it is a massive interest graph: “Tumblr is one … Continue reading If Tumblr is worth $1.1 Billion, is Pinterest worth $19 Billion