Re: a girl
what about Gulaab jaman? 
On the serious note. First of all, have you met her in real life? Got to know her inside out? There are many relations where it is easier to get involved but the girl acts fishy and eventually just leaves you if she finds someone else. That being said. There are many girls who put cool pictures on their avatar and when you really get to know them and look at them on the cam or in real life, they turn out to be completely different.
if you are going to do it for the heck of a time pass than sure go for it.
If not than I strongly recommend being friends of her and than when you really know her, you should make a move.
Question, why would you wanna get in to online relationship by the way?