I found out how FB can work for you. If you can only FB-close a girl for whatever reason and can't get her number, just let some time pass. I #-closed three girls in the last two days, all of them I met at some point in life.

It's because being FB-friends builds comfort without having to put any effort in it. They see yo get tagged in pic's, they see your funny remarks every once in a while.

Let some time pass and then strike up a con ersation in IM. Ask for the number, you'll get it! I used these three:

1. I was in your hometown, but didn't have your number...
2. We should have a reunion with some of the fun people...
And of course
3. I have to gi now, give me your number so we can continue later...

Good luck!