The web is an open book.
Someone, somehow can get most anything that's posted anywhere on it and repost it somewhere you don't want it to be.
Just remember that commercial where the girl introduces this guy and says he's a French model. It said so on the web so it must be true, right??
If you wish to stay anonymous don't post. If you don't feel it will happen or you just don't worry about such things then proceed.
The keystrokes you make are your choice...