Many people's blood pressure was raised by what seemed like, "I can find out all about you", posts. These were subsequently followed by ones that changed it to be more like, "I meant that anyone else could find out all about you", but by then some sharp replies had been made.
BTW It is perfectly true that anyone who really wanted to could find out a lot about a poster by adding together all the bits of info that they give, and if their Facebook page gives more info that could be added on too and perhaps make their identity and location traceable. A couple of years ago I myself tried doing just that about someone on here -( just to see whether it was possible!!!) - and with a bit of crafty digging I found a name and address. If they had been posting something really personal, or something they subsequently regretted, someone nasty could have used that against them, as someone seems to have done against one of our regular posters!