You would think that nobody would share things like where they do their banking or what their stock portfolio looks like, but it happens. Especially with all the headlines of banks going bankrupt and stock prices plummeting during the 2008/2009 recession, it's easy for an innocent Facebook comment to reveal too much about your personal finances. Consider this scenario: You're posting to a long thread on a friend's wall about the bank crisis. You say something along the lines of, "We don't need to worry because we bank with a teacher's credit union," or even, "We put all our money into blue chip stocks and plan to ride it out." Again, if you're one the 40 percent who allow open access to your profile, then suddenly identity thieves know where you bank and where you have the bulk of your investments. It's easy to forget that what may seem like a harmless comment on a Facebook wall could reveal a great deal about your personal finances. It's best to avoid that kind of talk altogether.