ptc and gpt sites: worth trying or not?

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For the last 2 months I have been searhing and trying out various ptc or gpt sites with a view to earning some money on the side. But it seems to me that they are not worthy of my time and effort I would have to put in. In addition, both ptc and gpt sites do not provide enough opportunities for European countries. Also, I am not the kind of person who would be very fond of referring others to those sites. What do you think?