Finding Friends of Friends
Another way to find old friends is to look for people who are friends of your current friends. That is, when you make someone your friend on Facebook, you can browse through the list of people who are on his friends list. Chances are you find mutual friends on this list—people that both of you know, but you haven’t found otherwise.
You find friends of your friends on your friends’ Profile pages. Look for the box labeled Friends near the top of the page; these are the people on this person’s friends list. Click the box to view all these people.
Click on any name in this list to view that person’s profile page. To send a friend request to a person, click the Add Friend button. You’d be surprised how many old friends you can turn up this way!