Forget American Idol—when it comes to turning unknowns into household names, YouTube is king. The video-sharing network just produced yet another brand-new star: Baauer, the 23-year-old Brooklyn producer who just reached No. 1 on the Billboard Hot 100 thanks to the incredible viral success of his "Harlem Shake." But before Baauer quits his day job, click on to take a look at how these other YouTube sensations fared.
(Photos from left: Courtesy Glory Boy Entertainment, Jason Merritt/Getty Images, Ethan Miller/Getty Images)