On the final day of November, Facebook Inc. announced it had bought a customer service software startup most people had never heard of, in a deal valuing the company at more than $1 billion. Although it was the third-largest acquisition in Facebook's history, slightly more than it paid for Instagram in 2012, the deal drew very little notice. In Washington, where regulators are actively pursuing antitrust lawsuits against Facebook and politicians condemn almost every move the company makes, the purchase of Kustomer Inc. was met with crickets.

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