Be wary of small details you let through about yourself during the normal course of commenting. Once you're on their radar, they'll inspect each and every word you utter, compile a bunch of facts about you that you let slip through, and BAM. You're doxxed. Next, they're calling your employer and sending them listings of everything you've said. They're messing with your family and friends. Thankfully this hasn't happened to me, but I know someone it has happened to.