How to stop FB stalking?

[ZebraStripe]

A guy makes a fake account and sends me a friend request (even i didn't have a chance to reject it yet) and it allows him to see other possible people to add all from my friend list. He then tries to send friend requests to them to stalk me and harass me. Why does FB not keep out friend list truly private or allow the option? Why should it show up as other people he might know or can add just because he sent me a friend request that was not seen or rejected yet? I reject and block it and he makes another. What can be done?