The public can see who your friends are.
Many teenagers need to choose their facebook friends carefully, even they are from their community or class.Usually teens become friends with friends of their friends to increase his popularity. This is not advisable unless you know them personally. How ever I have friends whom I haven't met or talked. We are friends because we share same interests. Your friendship with certain people can be seen when someone searches for you.
You can hide your friend list from public To change the privacy for your friend list, log into Facebook on a computer, go to your own profile and open the Friends tab. Choose Edit Privacy on the menu in the upper right corner of the Friends section and pick the audience for your friend list. You can even choose Only Me if you don’t want anyone else to see your friend list. Your friends control their friend lists. Therefore you’ll be on their friend list.
When someone who isn't your friend searches for you, what they see depends on your privacy settings.Your public profile shows your name, username, gender, profile picture, cover photo and user ID, as well as groups you are in. Anyone can see your public profile.