Which "Bux" PTC sites are legitimate?

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I have come across a TON of PTC sites with "BUX" in the name. Neobux is the only one I have heard of as being reliable. Does anyone know of any other trustworthy "BUX" PTC sites, or do you know of any worthwhile PTC sites in general. I'm trying to diversify my portfolio in this realm and would greatly appreciate some advice!