I saw it in Heifer International. You can link your Twitter account to an online monitor that will charge you for every curse and obscenity. Charityswearbox.com has raised $59,698 for various causes. The current feature is cancer.
Turn a bad word into a good deed. Set the amount you will pay -- usually a dollar, could be more. Choose a charity from a list of a dozen good works. Enter a method of payment.