I noticed that when I was dating around it was extremely important that they could find my Facebook profile if I said I don't use Facebook much they would immediately respond with scepticism.

For that purpose alone I kept it.

And they have a point, it's easy to find out if someone is single or not via Facebook, and you are bound by your friends to be truthful.

I'm not single anymore, but I'm still curious, in those countries where everyone is not sleeping around with everyone what would replace Facebook?