The FBI was going to the Twitter, the Facebook and The Google. That's a lot of people.
Plus the Pew article indicates that all of the shown social media sites have more Democrats than Republicans,
My impression is the FBI was also briefing Fox News, National Review, Wall Street Journal, AP, CBS, ABC, NBC, WaPo, NYT, and so on about the potential for a repeat of 2016. It is widely reported that the Hunter Biden story peddled by Guilliani did not even meet the journalistic standards of Fox. So the Trump's team effort to sway the election with unverified material from copies of a hard drive that surfaced in October before the election failed, so the right is pixxed and blames left leaning social media. Even though NY post, Drudge, and other right wing media aired the story.