From Rebecca Black, to David After Dentist to The Evolution of Dance - what happens to YouTube stars after the upload isn't so fresh? We've got your answers for 20 top viral stars right here!
For those of you who don't know who Keenan Cahill is, he's a teenager who loves lipsynching to popular songs and putting them on youtube. Now some GLEE cast members join his many famous fans getting in on the act.