SAN FRANCISCO — In the tense days after the presidential election, a team of Facebook employees presented the chief executive, Mark Zuckerberg, with an alarming finding: Election-related misinformation was going viral on the site.President Trump was already casting the election as rigged, and stories from right-wing media outlets with false and misleading claims about discarded ballots, miscounted votes and skewed tallies were among the most popular news stories on the platform.In response, the employees proposed an emergency change to the site’s news feed algorithm, which helps determine what more than two billion people see every day. It involved …
