I have been doing some of these things for a while. I don't put any money out for anything and I don't buy anything. A lot of these, if you shop online, you can get points that go to your gift certificates.
Most are paid emails, they only pay you 1 or 2 cents, some are 5, but they add up and all you have to do is click on the link and when the site comes up, you can X out of the page.
Most will give you points or money to sign up. I won't put anything on here that I haven't been using for a while. I try them out and make sure they are not scams first. At the end of the year if you save up your gift certificates or have the checks sent to you, you can have a couple hundred dollars to offset Christmas, or do whatever else you want, maybe use them in the spring for your yard. You can even eat out with some of the gift certificates. There are certificates for almost every want that you may have.
You are not going to get rich off these things. There isn't any making $1000 in a week. This is a little at a time to add up. Some are links, right to the sites themselves, others I will have to invite you, so I will provide a link to send me your email address and which site you want to have a referral from. I'll add more as I try them out and see the results.
Use an email you don't mind getting extra emails in, sometimes they send you extra things, so you don't want to use your work email or anything.