You received this email because a Facebook member is inviting you to join Facebook. Facebook allows people to send invitations to their contacts by entering an email address or by uploading their contacts.
If you’re already registered for Facebook, your friend may have used an email address of yours that isn’t currently linked to your Facebook account. If you’d like, you can add this email address to your existing Facebook account to ensure that you won’t get Facebook invitations sent to that address in the future.
If you don’t have a Facebook account and would like to create one, you can use this email to start the registration process.
If you don’t want to receive invites from your friends, you can use the unsubscribe link in the footer of the email.