Germany's Facebook ruling signals trouble ahead - CNN

London (CNN Business)Facebook built a massive advertising business on what it knows about its users.

The regulator ordered Facebook to stop the practice in a ruling that experts say could shape the company's future — and potentially even lead to its breakup.

"In many ways, they are internally breaking up Facebook by limiting how they do business, how the different services interact," said Anu Bradford, a professor at Columbia Law School.

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