Okay, I can't recommend Testable.org to people anymore. The surveys the site's own developers have been putting up are broken or wonky, I'm fairly certain I will never get my payout for my referrals because hitting the $30 threshold will take at least a year, and their website interface is beyond frustrating. Honestly, if you're going to spend a year developing a site and testing it in beta I expect it to be a lot more user friendly for both participants and requesters (which there are extremely few of over there - and some are obvious reject happy scammers that the site ignores.)
Fuck them.