Emily May, a 31-year-old New Yorker, spent five years getting harassed on the street without telling anyone about it; then she realized a possible solution was in the palm of her hand. May developed Hollaback!, an iPhone and Droid app that lets users anonymously explain what happened, upload photos, and mark the incident's location on a Google map. That information then gets fed into the ihollaback.org network, which so far collects data on street harassment in 45 cities and 16 countries. When she has enough data about harassment in a particular area, May presents it to the local government and works with them to propose increased education funding or awareness programs. The number one piece of advice women get about how to deal with street harassment is to shut up and keep going, and I think that's the worst possible advice you can give.