He said making the changes will "encourage meaningful interactions between people".
The idea comes in their mind and is being implemented after they have received feedback from community that public content- posts from businesses, brands and media- is crowding out the personal moments that lead people to connect more with each other.
Referring to a research conducted on social media, he said, "research that shows when we use social media to connect with people we care about, it can be good for our well-being".
Mr Zuckerberg, who last week said his "personal challenge" for 2018 was to fix Facebook, said people may spend less time on the social network as a result of the changes.
The post further explains the reason behind the public content stating that video and other public content have exploded on Facebook in the past couple of years.
He cited academic research indicating that interacting with loved ones is crucial to a person's wellbeing, while reading news articles or watching shared videos may not be.
The overhaul means posts from businesses, brands and media will be demoted in the news feed unless they inspire back-and-forth discussion in their comments, or popular engagement in terms of shares and reactions.
"I'm changing the goal I give our product teams from focusing on helping you find relevant content to helping you have more meaningful social interactions", Zuckerberg said Thursday.
Zuckerberg conceded that such changes could hurt Facebook's core metrics in some ways, but indicated he felt the business pain would be worth it. The first changes you'll see will be in News Feed, where you can expect to see more from your friends, family and groups. One of the big criticisms of Facebook in the past 18 months is that the content we see in the newsfeed is driven too much by Facebook's obsession with persuading people to spend as much time as possible on Facebook. "Pages whose posts prompt conversations between friends will see less of an effect", he wrote in a blog post.
With people no longer having as much content to passively consume in their News Feeds, Zuckerberg said he expects some measures of user engagement will decrease.
Zuckerberg said he hoped the shake-up would boost the well-being of Facebook's two-billion-member community and make their time spent on the site "more valuable".
Because of that, he said that "the balance of what's in News Feed has shifted away from the most important thing Facebook can do - help us connect with each other".
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