How do I Prevent People I Don't Know from Friend Requesting Me on Facebook?

In terms of friend requests, Facebook’s privacy settings are somewhat limited. Options include accepting friend requests from everyone, or only members with whom you share a mutual friend. Although Facebook’s privacy settings do not allow you to prevent unknown people from sending you friend requests across the board, you can place limitations on your requests and use your block list to prevent individuals from future communication.

Log in to your Facebook account and click the gear-shaped icon in the upper right corner to navigate to your “Privacy Settings” page.

Click the “Edit” link beside the “Who Can Send You Friend Requests?” option on the resulting page.

Select the “Friends of Friends” option from the resulting drop-down menu to prevent friend requests from members who do not share at least one mutual friend.

Log in to your Facebook account and use the gear-shaped icon in the upper right corner to navigate to your “Account Settings” page.

Select the “Blocking” tab from the left side panel of the resulting page.

Type the name or email address of the person from whom you wish to block all communication, including friend requests, in the space provided.

Select the person from the resulting list and click the “Block” button to prevent all future interaction, including friend requests, from that individual.