The Internet is such that if you write anything and share it with anyone -- even in a completely "closed" community that isn't indexed by search engines -- anyone else reading it can also copy and paste it to anywhere else online. There's no technology to stop this sort of behavior, so that's why we encourage folks to ensure they choose their username wisely and not tied to any real-life clues as to your identity (if you feel it might be an issue with regards to the kind of stuff you're sharing here).

I know it may be scary, but it's the nature of sharing anything and writing it down... as long as you do so carefully, it shouldn't present any problem in your life.

DocJohn