Nowhere...I'm not sure I understand what you're referring to, but I do think the Internet allows savvy people (would-be stalkers or organizations) to gain access to our files. I have no idea how they do this, but here's an example:
About a year ago, I posted on a forum devoted to withdrawal, weaning off Paxil, the antidepressant. I came here to PC to tell folks in the medications thread about it, and told the people on the Paxil site about PC as well. Some people here didn't like some of the things on this man's website about Paxil, and voiced their concerns. He came back and said I was a "troll," and that I had many user names on various websites. I do, in fact, have a different name on Yahoo, and on IMDB, where I post movie comments, as well as on Ebay where I sell art. How he knew this, I have no idea! But it was an awakening for me.
Prior to this incident, a couple of years before, I was using the same name on all websites, for convenience, I thought. Not a good idea. A simple search brought up all my posts on a personal forum, which I learned was being survailled by someone I had just met. It was so embarrassing and ended disastrously.
Really, anything we post here on the Internet is open for public viewing, I guess, though in my searches for security purposes, I haven't seen any of my posts here on PC show up on the open Internet.
Patty