If you're not familiar with Justin Bieber (you're excused if you're not a 12-year-old girl), he is 16-year -old singer, who was discovered by his manager on YouTube, apparently after his mom uploaded videos of his performances so his loved ones could see them. According to What the Trend , Justin Bieber is popular right now because, he "has a lot of fans who like to tweet about him," and his new album was just released. It has to be more than that though.