Getting interest with PTC sites

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I've heard those PTC sites from friends before i knew mylot, but they were asking for membership fee for it about ($36-60). I don't know which site they were referring to but I haven't joined any of them yet. And still don't know if those were trusted ptc sites. But since I was in mylot I started to read about those ptc sites mentioned here and glad to know no more membership fees required. Now I started to do neobox and clixsense. What else can you suggest?