Plink is a website that links up to your credit, debit card or bank account that rewards you for making purchases at more than 50,000 retailers and restaurants around the country. They reward you with Plink Points which can be used to purchase gift cards at places like Amazon, Walmart, American Eagle, Zappos, iTunes, etc.
Right now, you will receive a $5 Amazon (or another gift card of your choice) just for signing up and linking up a valid bank account or card. Your account will be credited with 500 Plink Points (worth $5) within 5-10 minutes of signing up. Mine took about 5 minutes to show up, but it did, and I was able to get a $5 Amazon gift card for free!
If you are concerned about linking up your bank information, Plink uses bank-level security and encryption. They do not store your information and never share or sell your information. Plink does not ask for your debit or credit card number. You link your card by signing into your online banking using a secure connection. They are also members of the Better Business Bureau.