After you join Facebook, there are a few ways to find your friends or invite them to join:
Search for friends
You can search for your friends by typing their names or email addresses in the search bar. Learn more about adding friends.
Import your contacts
You can import your list of contacts from other places (ex: your email account, your phone) and we’ll find your friends for you. After Facebook imports your contacts, you’ll have the option to send a friend request to any of your friends that already have a Facebook account or send an invitation to friends who aren’t on Facebook. Learn more about importing your contacts.
Note: You can always manage your list of contacts, and the invitations & reminders those friends receive.