04/03/2013 12:02 pm ET

How Facebook Is Perfecting The Ad

From confidential reports, visits to the company’s sprawling campus, and interviews with its press-shy founder and C.E.O., Mark Zuckerberg, and C.O.O. Sheryl Sandberg, Kurt Eichenwald pieces together the largely unnoticed shift in Facebook strategy: new content, new algorithms, and new alliances, combined to power a marketing model that could have the rest of the world scrambling to catch up.

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