Further, last December, the European Commission laid down the law on changes Facebook needs to make regarding privacy, which will restrict access to personal data.

FORBES: Facebook Valuation: We Don't Know What We Don't Know

Carnegie Mellon University conducted a study following more than 5, 000 Facebook users over six years, from 2005 and 2011, and found that changes in the social network's privacy policies caused users to share more -- not less -- personal data.

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