FB and QL both are different in many ways as already said by other QL'ers...The biggest difference what I believe is that your identity is hidden here on QL while on FB all your friends know u (except someone adds strangers)...

CL- Why don't u tell us what's your FB ID as many girls on QL are using FB :P and BTW when u have girlfriend why u r always flirting with other girls ?? Its definitely not a good thing to do..