How to avoid from being scammed?

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Yes,it is commonly believed that people are earning nicely from internet--either by PTR or PTC or by PPC programs or by taking online surveys or data entry works etc.,but there are number of scams and cheaters also in these programs.And most of the time people get cheated. Free to join programs either pay very less or their minimum payout limits are reached quiet late and also they pay after a very long period of time.And most of the time they do not pay also. Therefore it becomes very difficult to believe and go for online earning streams or act on such 'work from home' programs.Are there any criteria for recognizing cheater companies and choose good and honest companies? My second and serious question is that is there any law or legal forum,where a scammed or cheated person can approach for justice and getting his or her lost money back? Please comment!