Facebook is making big, immediate changes to News Feed. The company will now prioritize content from friends, family, and groups over “public content like posts from businesses, brands, and media,” CEO Mark Zuckerberg wrote in a post-Thursday night. News publishers that have relied on Facebook for traffic will suffer: “Some news helps start conversations on important issues,” Zuckerberg wrote. “But too often today, watching video, reading news or getting a page update is just a passive experience.”
The change, Facebook admits, is major. Users will be given “more opportunities to interact with the people they care about,” which necessarily means less publisher content, Adam Mosseri, Facebook’s VP of News Feed, wrote in a post-Thursday:

Because space in News Feed is limited, 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. As we make these updates, Pages may see their reach, video watch time and referral traffic decrease. The impact will vary from Page to Page, driven by factors including the type of content they produce and how people interact with it. Pages making posts that people generally don’t react to or comment on could see the biggest decreases in distribution. Pages whose posts prompt conversations between friends will see less of an effect. READ MORE