"Caroline," a mom from St. Petersburg, FL, wasn't keen on her 11-year-old getting on Facebook, so she was furious when she discovered her daughter corresponding with a 23-year-old man through the social network. She wrote back to the older "friend" as though she were her daughter, and when his requests became explicit, she used her wits — and a Target mailer — to put him behind bars.

Watch the USA Today video below to find out how her one-woman sting operation got this predator off the streets.