Facebook says it's changing the computer algorithm behind its News Feed to limit the reach of people known to frequently blast out links to clickbait stories, sensationalist websites and misinformation.
The move is another step by the world's largest social network to weed out spam, a battle Facebook has fought for years but that gained urgency after hoax news stories spread widely during last year's US presidential campaign.
Facebook said the change would reduce the influence of a "tiny group" of people it has identified who share vast amounts of low-quality public posts daily. Only about 0.1 percent of people who share more than 50 posts a day would be affected.
The change would affect only links shared by those people, not their photos or other posts, the company said.
"Our research shows that there is a tiny group of people on Facebook who routinely share vast amounts of public posts per day, effectively spamming people's feeds," said Adam Mosseri, Facebook's vice president for the News Feed, in a blog post.
The algorithm behind the News Feed determines which posts people see from friends, advertisers and other sources, and the order in which they appear depending on how users responded to previous posts.
Facebook, which has 2 billion monthly active users, frequently tweaks its computer code.
In May, Facebook announced a change that would give lower prominence to links that lead to pages full of deceptive or annoying ads.
A change in August was designed to deemphasise stories with clickbait-style headlines.
Friday's change will de-prioritise links from specific spammers, Mosseri said.