One of the biggest changes to Facebook's News Feed in recent years is finally getting the attention it deserves.

Last October, The Guardian first reported that Facebook intended to split its algorithmic News Feed into 2: one for non-promoted posts from Pages and publishers - called "Explore", and the second for your friends and family.

In a blog post, Facebook's head of News Feed, Adam Mosseri, said the experiment was motivated by "consistent feedback" that people wanted to see more from friends and family and less from media organizations and businesses.

The change, didn't go over so well in the six countries Facebook used as a testing ground: Bolivia, Cambodia, Guatemala, Serbia, Slovakia, and Sri Lanka. Aside from the backlash by news organizations, Facebook found that separating the feeds didn't actually lead to increased connections with friends and family as it had intended.

Without warning, Facebook made a substantial change to the News Feed. And according to some users in the test markets, few had any idea what had happened to their News Feed, or how to best utilize Explore.

To be clear, this in no way impacts changes to the News Feed announced last month. In January, Facebook announced it was prioritizing "meaningful social interactions", a move that would feature more posts from friends and family and fewer updates from media organizations and businesses.