The referral code is a code a friend of yours may have sent you (if you followed their referral link, it's already filled out) which allows them to receive credit for your signup and makes you and your friend automatic friends in our social networking system.

If you followed the referral link supplied to you by your friend or found in a referral e-mail, your referral code should be filled out already. If it is not, please follow the link or manually fill out the supplied referral code.

If you were not referred by a friend you may leave the referral link blank.