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The companies face down the fake news problem by starting with the money.
Google will start by cutting off its ad-selling software to sites promoting false information.
One report said an outpouring of sympathy directed at Clinton supporters could have caused the glitch.
The company is on pace to reach $27 billion in revenue this year.
A short campaign in September resulted in thousands now registered to vote.
Facebook is rolling out a new "Marketplace" feature in four countries.
Facebook's overestimation of a video metric upset several advertisers.
Facebook CEO Mark Zuckerberg and his wife Dr. Priscilla Chan will invest this money over a period of 10 years.
Why the social network is making it harder for ad blockers to work on its site
But the method comes with risks, says one professor.
