Questions about PTC's, PTR's, etc

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With the boom of PTC's (paid to click), and other paid-to sites. Have you ever asked, which one was the oldest or which ones came first? I think almost all internet users has this kind of site to earn even a little amount of money. I for one has so many PTC sites and PTR's. But still kept wondering, who invented this sites or who created the first Paid-to site? Has anyone here knows about the history of this? Care to inform and share? Have a nice day to all.