Imagine the opposite of Foursquare — an app you can use to steer clear of particular individuals rather than meet up with them — and you grasp the idea behind the Hollaback iPhone app.

The New York Times spotlights the application, which people can use to notify one another of unsavory types who are spreading their creepy intimidation around. Using the app, you can snap pictures of the offenders to use to warn others and notify the authorities.

If you’ve used Hollaback or know of something similar, how has it worked out?

Phone Apps Aim to Fight Harassment [The New York Times]

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