They may not have made the list this year, but we're keeping an eye on these rising stars.
A social media researcher for Microsoft Research and a fellow at Harvard University's Berkman Center, Boyd is helping to shape the debate over privacy on social networks. Boyd is a polymath -- a social scientist with a degree in computer science -- who has made a career out of questioning the status quo. She took on Internet giants Google and Facebook in her opening remarks at this year's influential SXSW Interactive Festival, and she is considered the reigning expert on how young people use the Internet.
NEXT: Eric Edidin