Most affiliate programs actually will insert a tracking cookie to your pc. Now don't panic these are not the same as the ones that are sending your surfing activity out. These basically just show that you have been to the site and where you came originally. This is to give credit to the person who originally got you to the site. Depending on the program depends on how long the cookie works. I have seen a few for as little as 24 hours and others that are up to 90 days.

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