Are PTC sites effective to you to earn online?

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I heard PTC sites but not yet serious about it.Maybe because it takes time to register or it takes more knowledge for me in using PTC sites.Abe, a friend of mine here in mylot, once says that he earns from it.However, it seems that I was busy thinking of many things that time.And now, since I taught that this is one of my ways of stress management, I got interested to try. Are PTC sites effective to you to earn online?What are the PTC sites you could suggest which are rewarding?