Shadow profiles are the biggest flaw in Facebook’s privacy defense

Called before Congress this week, Mark Zuckerberg tried to present Facebook’s approach to user data as open and transparent. In question after question, he focused on the privacy choices available to users, and their ownership over all the data they share — and it wasn’t all wrong. Facebook has data because users share it (mostly). Users control that data and can review it or delete it whenever they want (with a few exceptions). And if you delete your account, (almost) all of