PTC or Paid-To-Click advertising can be another source of referrals. When you click on the ads with these sites you earn cash or points. Some sites pay out cash which you can then use to buy advertising on their site. Some let you directly transfer your cash into advertising credits. Some have you convert the points into the kind of advertising you want such as links or banners. Here's a few to get you started! By the way, these are free for you to sign-up and click on ads!
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