Facebook is testing a change that could have dramatic effects on media organizations and other businesses that use its network to distribute information.

The change affects posts published on Facebook Pages, profiles that are reserved for public figures, businesses, and other organizations.

In six countries, Facebook has removed all posts published on Facebook Pages from the main News Feed and moved them to a separate and less prominent “Explore” section in its app. The change leaves the main News Feed reserved for only posts from friends, ads, and individual posts that organizations operating Facebook Pages pay to promote.