![David Karp: The 26-Year-Old Whose Tumblr Rules The Web](https://webarchive.library.unt.edu/web/20130102205245im_/http://i.forbesimg.com/images/channels/hometopfeature_panel1_0_mainstory-1357141686.jpg)
David Karp: The 26-Year-Old Whose Tumblr Rules The Web
If Facebook is the Internet's phone book and Twitter its wire service, David Karp has built Tumblr into its creative canvas. But with an $800 million valuation and momentum at his back, can he shape the platform into a money machine?
![Jeff Bercovici](https://webarchive.library.unt.edu/web/20130102205245im_/http://blogs-images.forbes.com/assets/images/avatars/jeffbercovici_40.jpg)