Facebook has tinkered with the News Feed in an effort to cough up more relevant stories.
Sing me a song
Facebook is teaming new signals with a real-time prediction algorithm to better identify stories considered authentic and more targeted to your preferences.
Facebook also takes into account the relationship between you and the user or Page that's posting.
Stories from reliables sources that are quickly generating chatter (for example, a trending story from The New York Times getting lots of Likes, comments, and shares) will be given greater preference.
Conversely, posts exhibiting "spammy" behaviour (asking for Likes) will be penalised.
Keep it real
The update appears to be addressing two ongoing problems with the News Feed: spam and fake news.
Happily, avoiding fallout from Facebook's latest update is easy. Just continue to publish authentic, engaging, and relevant content.