I just Read this in the FAQ Section :

What are referrals?
If the administrator has enabled referrals, you will see a field in your profile detailing how many referrals you have received. You gain referrals by promoting VB Q and A using your unique referral link that looks like http://forums.vb-world.net/index.php?referrerid=14681 - Each time someone follows your link to VB Q and A and registers your referral count will be incremented by one. You administrator will have more information on any prizes or rewards that may be given out for referrals. Please be courteuos when promoting VB Q and A by not spamming other web sites with your referral link just to gain referrals.
Cool..So we can Expect Some nice rewards for Referrals.