OCCUPATION: Founder of Wikipedia
NUMBER OF TIME COVERS: 0
PREVIOUS APPEARANCES ON THE TIME 100: 1
PRO: Founder of the free online user-generated encyclopedia, Wikipedia.org, the Web's 9th most popular site with 42.9 million unique visitors a month.
CON: Wikipedia has had to refine its "anyone can edit" policy because of constant factual inaccuracies, and is still widely considered an unreliable source of information.