Or because the song is quite good and the video is amazing.
Correct me if I'm wrong, but does Justin himself have a UK #1?
How can he, with all the promo, not get a #1, but just 1 photo with a "random" girl get her a #1.
It wasn't because of the picture. It was, if anything, because of the viral video that Bieber, Selena, Ashley Tisdale, some dude from Big Time Rush, and others made. However, I feel that's only one small reason compared to the fact that the song's ****ing catchy and the chorus is pretty much infectious.