Explore. The feed generally features posts from Facebook Pages users don't follow. News Feed, meanwhile, hosts posts from friends and Pages users do follow.
But that's not true for everyone. In six markets, Facebook has removed posts from Pages in the original News Feed and relegated them to another feed, Filip Struhárik, editor and social media manager at Denník N, wrote. That means Facebook's main feed is no longer a free playing field for publishers. Instead, it's a battlefield of "pay to play," where publishers have to pony up the dough to get back into the News Feed.
http://mashable.com/2017/10/23/facebook-explore-publisher-post-organic-reach-drop/#vaZoE5xdcPq8
they already responded and said that they were not planning to roll this out further. Apparently this was a variant on the wider explore feed tests that they have been running