Facebook general counsel Colin Stretch told a hearing that Instagram posts by suspect Russian accounts were seen by some 20 million Americans last year.
"We now discovered, in the last 48 hours, 120,000 Russian-based posts on Instagram," Stretch told the Senate Intelligence Committee hearing.
The latest data on Instagram is on top of the estimated 126 million Americans exposed to Facebook posts from Russian entities seeking to create divisions during the election campaign.
The hearing was the second in Congress this week in which social media and internet firms including Google and Twitter have been called to explain how fake news and other disinformation was allowed to spread during the election campaign.
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Many of the social media posts came from the Internet Research Agency, which has been linked to Russian intelligence efforts to disrupt the US election.
Twitter told lawmakers yesterday it found that nearly 37,000 automated "bot" accounts with Russian links generated 1.4 million tweets that were seen by a potential 288 million people in the three months before the November presidential election.
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