Why and how did Dubstep suddenly become popular?

I have been a big fan of electronic music for quite some time now but why has Dubstep become so popular lately? Within the last year or so it seems like Dubstep went from being a relatively obscure genre to a well known craze. A lot of people who don't know any electronic music now think its "cool" to listen to Dubstep. Don't get me wrong dubstep is totally okay and some of it is really good but I think there is better electronic music out there. What made it so popular all the sudden?