"Out-Security" is anything you do that would allow someone who might mean you no-good a way to find you or entry to your home, or anything like that.
In this particular case, while I'd love to say that I know I can trust everyone on this board, to be completely honest there are a LOT of people here I don't know at all. And even if that weren't the case, who knows who might be lurking a bunch of different message boards looking for information like this? Everyone from child molesters to weird stalkers to :::shudder::: commerical demographers.
You may think this is the height of paranoia, and if so, you apparently haven't seen what I have:
My job keeps me pretty busy now, but back when it consisted of 15 minutes of real work and 7 hrs 45 min of trying to LOOK busy, I used to "patrol" certain online chatrooms - ones dedicated to N'Sync, certain toys, things like that. I had someone in those rooms trying to lure 10 year olds to meet them pretty much EVERY DAY. Not to pat myself on the back, but thanks to my being there looking for that crap, those that I saw found themselves flooded off the 'net with their nicks and their IPs banned from the chat service. Admittedly, that didn't stop them forever - time to sign up again for them, I guess. But not on my watch.
I was constantly counselling kids on what NOT to tell people online. A thirteen year old girl mentions what state she lives in, her school mascot, and a local pizza shop she and her friends hang out at after school a lot, and even if those seemingly harmless items were in different conversations on different days, she may have just given a dedicated child rapist what he needed to find her. And this doesn't just apply to kids, either - unfortunately, a lot of parents choose to put up personal info and family pictures and such on their personal pages. Some pervert just said, "Thanks for the catalog."
I believe in the overall goodness of humanity. But out of the ones who AREN'T, there are some smart and dedicated devotees to their sicknesses, and one has to be careful anywhere people can be anonymous - cause there may be very little way to track them when they act and its too late.