Wikipedia:Wikipedia can be dangerous
|This essay contains the advice or opinions of one or more Wikipedia contributors. Essays are not Wikipedia policies or guidelines. Some essays represent widespread norms; others only represent minority viewpoints.|
Wikipedia can be dangerous, because everything you typed will be stored on the server permanently. Sometimes you have to be extra careful when saving a page, remember to check if it contains personal information and whatnot to identify you.
If you do realize that you've added personal information to a page, contact an oversight and have it hidden from the public view.