My friend told me about this facebook app, rewardia.
Basically you collect points and refer friends. 1000 WoW gold is only 50 points and it takes like half an hour to get these if you do it right.
-- Removed Referal Link --
Here's mine it:
Login | Facebook
You'll get 10% of the points each of your referral acquire. The referral still gets 100% though.