John Yang:

U.S. intelligence agencies now also believe that false text messages sent last month to many Americans about a nationwide lockdown were pushed by Chinese operatives aiming to sow discord.

And there are the recent nationwide protests of stay-at-home orders that President Trump has at times encouraged. The seemingly organic movement was, in fact, organized and driven by far right Facebook groups that have become a hotbed for conspiracy theories.

Social media giants, including Facebook, Twitter and YouTube, have all faced growing criticism about their role in the spread of misinformation.

Facebook, which is a funder of the "NewsHour," now alerts users when they interact with false coronavirus content. On another popular platform, Reddit, users have long policed each other, to varying degrees of success.