We leave small clues about our lives all over the Internet like fingerprints.

Take Melvin Colon, who is facing charges of murder, along with weapons and narcotics-related crimes. The suspected New York gang member posted public photos on Facebook that showed him flashing gang signs but made private more incriminating posts, including references to past violent crimes and threats against others.

Unfortunately for Colon, one of his Facebook friends agreed to give police access to Colon's "private" information...