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Tumblr: David Karp's $800 Million Art Project
Facebook is the Internet's phone book. Twitter is its wire service. In Tumblr, 26-year-old Karp has built the Web's canvas. Now can he shape it into a money machine?
![Jeff Bercovici](https://webarchive.library.unt.edu/web/20130117061121im_/http://blogs-images.forbes.com/assets/images/avatars/jeffbercovici_40.jpg)
Facebook is the Internet's phone book. Twitter is its wire service. In Tumblr, 26-year-old Karp has built the Web's canvas. Now can he shape it into a money machine?
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