If you haven’t tried out a tumblelog, it’s fab. If blogging is what you do while you’re doing something else, tumblelogging is what you do while you’re blogging. And Tumblr is to blogging as telepathy is to talking. I tumbloged a road trip across 2/3 of the U.S. this month. MediaBistro’s Sammy Davis did a nice story about the East Coast roots of Tumblr, and the man behind it. So What Do You Do, David Karp, Founder of Tumblr?