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A Twitter campaign to influence U.S. voters was amplified by high-profile retweeters.
Facebook said it squashed “a bug.” Researchers say it is hiding crucial information.
Ordinary Americans unwittingly played a key role in spreading Russian content.
Operations were sophisticated and exploited links between platforms.
The problem of Russian meddling on Google and Facebook is much greater than has been previously revealed.
The Russia investigations are prompting new scrutiny of the technology giant’s advertising business.
Stephen Paddock was a casino regular, known to place large wagers and live for long stretches at Nevada hotels.
People caught up in this web of tracking and disinformation would have had no indication that they had been singled out or that the ads came from Russians.
More than 3,000 ads were sent to Congress on Monday, including many originally aimed at sowing discord.
The company also begins a crackdown on political ads, though the effort likely would not have stopped the Russian operatives who sought to sow dissension and disinformation during the 2016 campaign.