PTC's & Other sites

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I see so many people here talking about PTC sites & survey sites. I'm only member to 3 of them other than mylot, so I guess that makes it 4. Sometimes with work & all, I have hard time keeping up with them. I'm not here to ask for different site names or referrals or anything, I was just wondering how many sites you guys belong to & how you keep up with all of them.