PTC Sites

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I have recently been reading up on various PTC sites. There seems to be an abundance of them out there so I was wondering whether you could give me some tips with regard to ptc sites. Which sites are the best? and most importantly can you earn money with these sites? For Example: lets say I spend an hour a day on ptc sites. How much can I expect to earn in a month? How much money can people actually earn with these sites?