A Look Inside the Tactics of Definers, Facebook's Attack Dog
Alice Clearwater
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SAN FRANCISCO - A small firm called Definers Public Affairs brought the dark arts of Washington's back-room politics to Silicon Valley when, while working for Facebook, it began disparaging other tech companies to reporters. But a few days before Sheryl Sandberg, Facebook's chief operating officer, testified to Congress in September, Definers set its sights on a different target: the senators about to question Ms. Sandberg.

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