i do not know because there both popular
I neither know nor care. If you care, you need to get a life.
Both are popular, but Justin Bieber is more popular.
justin bieber its most popular, its the truth i like more shawnm mendes but justin its more popular
Justin Bieber..
Probably Justin Bieber
well Katy perry does have more twitter followers but justin bieber is more popular
yes one direction is more popular
Justin Bieber of course!
Justin Bieber.
One Directionone directionNo, definately no believe me :D
both of them are popular but I say One Direction Are More Popular