http://www.sciencemag.org/news/2020/10/us-election-nears-researchers-are-following-trail-fake-news

It started with a tweet from a conservative media personality, accompanied by photos, claiming that more than 1000 mail-in ballots had been discovered in a dumpster in Sonoma county in California. Within hours on the morning of 25 September, a popular far-right news website ran the photos with an “exclusive” story suggesting thousands of uncounted ballots had been dumped by the county and workers had tried to cover it up.

In fact, according to Sonoma county officals, the photos showed empty envelopes from the 2018 election that had been gathered for recycling. Ballots for this year’s general election had not yet been mailed. Even so, within a single day, more than 25,000 Twitter users had shared a version of the false ballot-dumping story, including Donald Trump Jr., who has 5.7 million followers.