Do you have tips on how not to be scam by PTC sites.

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Many ptc sites come and go, some are on their launching stage.They are increasing like mushrooms.Do you have tips on how to avoid being scam by this fly by night PTC's I I have join many of them and sad to say mostly are scams.But before i join I read some reviews like forums and inter action on other socializing site but still I guess we can't predict if they are or not to be a scam.Can anyone give us ideas on how to avoid them because aside from time you lost also money invested on them.