With so many different survey and rewards sites/apps mentioned in this article, you may be wondering how many you should sign up for. Really, it depends on how aggressive you want to be when it comes to maximizing your rewards. The more sites you sign up for, the more potential you'll have to get free Amazon gift cards. But signing up for a lot of sites can also be overwhelming. My advice would be to start with just a few sites (Swagbucks, MyPoints, Survey Junkie, and MobileXpression would be a good starting point), and then you can add more later on if you want to increase the rewards that you can earn.