As this guy said hes paranoid. Like really paranoid i dont like how people who arent very tech savvy take things so heavily first off a public proxy stores your records just like a forum would. As stated above your gonna want to use TOR if you want to be safe but i doubt you would ever get it running. I consider myself pretty tech savvy and i couldnt ever figure tor out nor would i care enough to figure it out as im not selling drugs online or something im jsut browsing a forum maybe id proxy if i was growing MAYBE.