You can lock down your Facebook account all the way. I can’t even get friend requests from people. After the initial few real friends I put in before I locked it down so now I can only get suggestions from existing friends to add friends.
After that it’s a great way to keep up with your friends and family, especially if they are as geographically spread as mine.
I did the same thing. The thing that really freaked me out was when I accepted the first friend request, I could see all her friends and realized she would be able to see all of mine. I felt like I would be violating my friends' privacy without their permission.