1.They could really be 56 instead of "18"
2.Instead of having that amazing beach body like they described they could look horrible(Not that this matters in a relationship)
3.You have no idea if they are who they say they are.
4.You have no clue if they could be a wonderful person..or a killer.(Eh..I think that was a little bit too far...Sorry)
5.That dreamy guy you've been chatting with...Could be a chick.
...And 6.What does this have to do with Justin Bieber?