After you sign up, you’ll receive surveys on various topics and products via email. Once you complete these surveys and build up a stash of “points,” you can redeem them for cash via PayPal, purchases made through Amazon.com, or gift cards to various retailers. As an alternate suggestion, you can even redeem your rewards as a donation to the Red Cross.
Most reviewed paid survey sites effectively promise not to share personally identifiable information or not to share it without your consent. It's an industry standard by which legitimate marketing research firms are bound. But many membership sites reviewed don't make either promise or do so only in a limited or wishy-washy way. Unauthorized go-betweens don't have to honor marketing research privacy standards.
IOCS is a not-for-profit research organization that conducts studies and experiments on shopping-related behavior – things like how we, as consumers, evaluate products, how we make the buying decisions, etc. Although the focus is mostly on shopping related behavior, some of their experiments and studies include broader areas of marketing, psychology, and economics.