YouGov is one of the biggest market research companies in the world. For some demographics this translates to a lot of paid surveys. Your mileage may vary. Get 2000 points (about $1.50) just for joining and another 2000 points for joining from this site! Note that you won't get the second 2000 point bonus until you've completed 4 surveys so stick with it! By that point you should be halfway to the $15 payout minimum.
YouGov payments are made via gift card. We rarely review these kinds of companies because there are plenty of alternatives that pay in cash. In YouGov's case, though, we decided to include them due to their place in the industry and the easy to use cards (Amazon.com is one option).
Referral Program: 2000 points for each referral.