[Amazon] Gifthulk Codes
Their rewards are gift cards to be sent via email or Paypal.
Sign up and receive 50 coins:
There are 6 ways to earn coins, all listed under "Earn Coins" along the top bar:
1. Offer walls.
There are 9 offer walls. Offers include watching videos, surveys, tasks, trial offers, downloads, registrations, etc.
2. Hulk EDS (Email, Download, Samples)
This is another offer wall. I don't know what is so particular about it.
3. Hulk Fountain of Youth
Occasionally, there will be codes for coins released via their Facebook or Twitter. Go to the HFY to redeem them. You'll get a unique 3 coin code for liking their Facebook.
4. Daily Poll
Answer the poll to receive 1 coin.
There is currently a photo contest going on their Facebook.
You'll receive 10% of your friends earnings.
Use the tools in the referrals section to make posts to your Facebook or Twitter with your referral link embedded.
$5 Amazon: 149 coins
$5 Paypal: 179 coins
$25 Paypal: 350 coins
View all GCs here
There are a ton ranging from gaming memberships to megaupload accounts and GCs to major retailers like iTunes and Starbucks.