2008: Justin Bieber YouTubes his way to your little sister's heart
Hardly anyone scoured YouTube for musical talent in 2008, the heyday of Myspace and American Idol. But precocious Canadian tween Justin Bieber (or his mom) showcased his singing and performing skills on the video site, initiating a chain of events that led him to music management whiz Scooter Braun, Usher, and Island Records. With the release of his debut album, My World, in 2009, Bieber's success was instantaneous, almost instantly usurping the Jonas Brothers. His latest album, Purpose, is something of a comeback after years of bad publicity, though Biebs has been one of the most consistent presences in pop culture over the last six years, rarely out of the public eye.