WaPo:

Federal law enforcement officials huddled with Facebook, Google, Microsoft and Twitter on Wednesday to discuss election security ahead of the 2020 presidential race, according to several U.S. and industry sources, amid heightened concerns that social-media sites are still vulnerable to the spread of disinformation online.
The meeting at Facebook’s headquarters in Silicon Valley included security officials from each of the four tech companies as well as representatives from the Department of Homeland Security, the Director of National Intelligence and the FBI, the sources said, requesting anonymity because they were not authorized to discuss the meeting on record.