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Facebook: Russian pages may have reached majority of U.S. users
Facebook CEO Mark Zuckerberg. Photo: Manu Fernadez / AP

More than half of the Facebook's users in the United States were exposed to Russian attempts to sow discord before and after the 2016 presidential election, a company executive will tell lawmakers Tuesday, while arguing that the reach of the campaign was still limited given the platform's massive scale. Google and Twitter will also disclose that the Russian influence campaign stretched beyond what they've previously discussed publicly.

Why it matters: It demonstrates how Facebook's mechanics allowed the Russian operatives to reach far beyond just those people who followed their fake pages and account. Significantly, for lawmakers, it underscores that the roughly 3,000 ads that Facebook disclosed in September from the Russian pages were just one small piece of the puzzle.