Take a look about 3 posts up at what pasenseoso said :)
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PTC means Paid to Click, where as PPC is Pay Per Click. There is a big difference in quality and targeted traffic between the two.
i like AdSense
PTC is a waste of time.
Best PTC and PTR site list
no-minimum.com
donkeymails.com
getpaidmails.com
gptclicks.com
adsense.som
I love 7 search