I've grown tired of warning people about this crap. It particularly irks me when idiot friends from high school/my early 20's post stupid shit on my wall that everyone else can see.
These days, I really only log in to facebook once a day to give my "home page" a quick glance and then its on to my own profile to clean up any retardedness someone may have left on a previous status update or wall posting. I really need to get around to just blocking people from writing anything there.