tips in detecting ptc scams...

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Would anyone know how to detect if the PTC site is a scam? Been checking the legitimacy of PTC sites with the aid of ptc investigator and ptc scam list... but i myself icannot confirm the reliability of this sites. Can't rely on the PTC sites forum showing proof of payment... who knows, the admin or owner might be the one who posted it. Can you suggest some sites which would give you very reliable reviews on this PTC sites? Or do you have any tips TO DETECT PTC SCAMS?