In March 2008, as Facebook was speeding toward 100 million users and emerging as the next big tech company, it announced an important hire. Sheryl Sandberg was leaving Google to become Facebook’s chief operating officer. CEO Mark Zuckerberg, then 23 years old, told The New York Times that Sandberg would take the young company “to the next level.”

Based on her time at Google, Sandberg soon decided that one area where Facebook was behind its peers was in its tax dodging. “My experience is that by not having a European center and running everything through the US, it is very costly in terms of taxes,” she wrote other executives in an April 2008 email, which hasn’t been previously reported. Facebook’s head of tax agreed, replying that the company needed to find “a low taxed jurisdiction to park profits.”

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