Why is this risky behavior? Because the more information you put out there, the easier it is to target you, particularly if the criminal already knows what you look like.

Last month, a to charges of blackmailing a young girl to send him pornographic images of herself after contacting her on Facebook. James Dale Brown somehow got a hold of sexually explicit photos of the girl and used Facebook to find her and demand she send him a video of her having sex. Brown used the alias 'Bob Lewis' on Facebook and eventually sent links to an explicit image of the girl to one of the victim's 'friends.'

And in January, another California man, George Bronk, admitted to breaking into e-mail accounts to find explicit photos of women. Bronk said he used Facebook to learn answers to the security questions that many e-mail services, such as Yahoo and Gmail, use to reset passwords and compromised the accounts using that information.

Facebook photos are also the reason why some people . A finds seven percent of organizations have fired an employee because of activity on social media sites, such as questionable photos that show the user in a less-than-desirable light.