It's estimated that one in every four people on Earth pay a bribe every year, with a total cost of $1 trillion. Bribes are said to be one fourth of Afghanistan's GDP. Can social media campaigns make a difference? Websites exposing petty bribery are "spreading like kudzu around the globe," following the paradigm set by IPaidABribe.com in India. There, it costs an extra 10,000 rupees to get a legitimate income tax refund and 120 rupees to get a birth certificate for one's own baby. That's according to Stephanie Strom in today's New York Times.