Zuckerberg acknowledged that social media sites such as his can contribute to "sensationalism, misinformation and polarization. and if we don't specifically tackle these problems, then we end up amplifying them".
He maintains his Outperform rating and $205 price target on FB stock, but he had important reminders about the lack of corporate governance at the company-something that would raise some serious flags if we were talking about nearly any other company besides Facebook.
Facebook users are going to have to take extra steps if they truly want to see News Feed posts from their favorite sports teams, news media outlets, their local churches, restaurants they like and more.
News organisations immediately began considering how they would fare in the ranking.
These aren't foolproof remedies for avoiding fake and biased sources on Facebook - but as Facebook continues to make changes to its News Feed, they may become increasingly important. Fortunately, it sounds like individual creators (like certain, ahem, cartoonists) may fare better, algorithmically-speaking, than big publishers.
Facebook has had a stormy relationship with news organisations, especially those with strong political leanings. This comes after putting loads of effort into building up Facebook as the place where people get their news.
In its announcement on Friday, Facebook warned that publishers who scored low on the trustworthy rankings may see their traffic decline.
This change is separate from a recent redesign to Facebook's user news feed, which brought posts from news publications down from 5 percent to 4 percent of what users see.
"We decided that having the community determine which sources are broadly trusted would be most objective", Zuckerberg wrote.
Facebook did not disclose what media outlets made the cut based on the survey results and other factors. As such, posts from news pages will populate a smaller portion of users news feeds, and Facebook will trust users to determine what sources should appear.
Facebook formerly relied on its own staff of human editors to curate the news, but the company came under fire in 2016, after a whistle-blower alleged that editors sought to suppress stories with politically conservative content.