News outlets quickly began reporting a loss in website traffic after the change and now the same outlets are suggesting the change actually helped promote fake news rather than fight it.
Facebook's January 11 announcement about the changes it's making to the News Feed explained that "showing more posts from friends and family and updates that spark conversation means we'll show less public content, including videos and other posts from publishers or businesses".
He wrote in the blog post: "We surveyed a diverse and representative sample of people using Facebook across the United States to gauge their familiarity with, and trust in, various different sources of news". "Social media enables people to spread information faster than ever before, and if we don't specifically tackle these problems, then we end up amplifying them".
The changes came after Facebook - and the broader tech industry - came under a barrage of criticism over its impact on society, from its role in spreading Russian propaganda and misinformation during the 2016 United States presidential election to its impact on childrens' mental health.
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The company said it wasn't "comfortable" deciding for itself whether or not a news outlet is reliable.
In short: "Trustworthy" is not the same as "accurate".
He also announced that Facebook would shrink the content on its News Feed from 5 percent to 4 percent.
"We feel a responsibility to make sure our services aren't just fun to use, but also good for people's well-being", Zuckerberg wrote in a blog post last week.
The company made a decision to use community input to rank news sources in an attempt to be as objective as possible, Zuckerberg said. "It will only shift the balance of news you see towards sources that are determined to be trusted by the community".