Over the last two days, Facebook CEO Mark Zuckerberg was questioned for more than 10 hours by two different Congressional committees. There was granular focus on privacy definitions and data collection, and quick footwork by Zuckerberg—backed by a phalanx of lawyers, consultants, and coaches—to craft a narrative that users “control” their data. (They don’t.) But the gaping hole at the center of both hearings was the virtual absence of questions on the tactics and purpose of Russian information operations conducted against Americans on Facebook during the 2016 elections.

Here are the five of the biggest questions about Russia that Zuckerberg wasn’t asked or didn’t answer—and why it’s important for Facebook to provide clear information on these issues.

1. What were the tools and tactics used by Russian entities to execute information operations against American citizens, and what were the narratives pursued?

In both hearings, in answering unrelated questions, Zuckerberg began to describe “large networks of fake accounts" established by Russian entities. In both instances, he was cut off. This was a significant missed opportunity to pull back the curtain on the mechanisms of Russian information operations against the American public.

The vast majority of information made available by Facebook—and the focus of questions in response—have been about ads and promoted content from Russian entities like the Internet Research Agency[1]. In fact, this was not the primary means of distributing content, collecting information, identifying potential supporters, and promoting narratives. The main tool for this was fake accounts posting "native" content—plain old Facebook posts—building relationships with real users.

In Wednesday’s hearing before the House Energy & Commerce Committee[2], for example, Zuckerberg said that tens of thousands of fake accounts were taken down to prevent interference in elections in 2017, implying that this was mostly relating

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