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An illustration of an Apple iPhone displaying the Facebook app's splash screen in front of the login page.
Today, Facebook is announcing a new feature which will let users track each other, called "Nearby Friends."
The company says it's a great way to connect with friends in real time, but critics worry that it could be a real invasion of privacy. For more on this, we turn to Reed Albergotti who's been reporting on this for the Wall Street Journal.