What is Paid ( Or Maybe Pay) To Promote ( PTP ) ?

Indonesia
October 15, 2009 9:09am CST
Well i sometime hear it in a forum or in discussion but i don't understand what it means? Can anyone explain it to me what is "paid to promote", what the difference between PPC or PTC? And it would be great if you could also tell me an example site of ptp site. Thanks
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