My favorite source of biking articles, The Wall Street Journal, (laugh, laugh) has an online article about how social media help people find lost bikes. According to this article, Heather McKibbon used Facebook to track down her stolen Cannondale, contact the police and setup a sting operation to trap the thief.
Several organizations that help owners track down their stolen bikes have come to the forefront. If your bike is stolen you might want to enlist your Twitter followers to help apprehend the crook.
Link to the Wall Street Journal article APB to the Web: Find My Bike!