emily: david karp, founder and c.e.o. of tumblr. thank you for joining us. as really been great to have you. david: thank you for hanging out. this was really fun. ♪

c.e.o. who has refused to keep a schedule. david karp started tumblr before he was 20.ld it to yahoo! for about a billion dollars before he was 30. it is now one of the most creative and social blogging platforms, all from a guy who dropped out of high school, lives in a loft, and drives a vespa. joining me today on "studio