Here are the sites I'm using to communite with other ptc members;
Mylot, here you can find a lot of ptc earners and even other kind of people. But they all want to earn money and post at this paid-to-post forum.
There are also some other ptc forums but less important. If you want to find more, just search "ptc forums" on google. But you will find a lot of inactive forums with very bad admins that can be easily manipulated.
Enjoy and don't forget to follow thebestptcsites at facebook!