Facebook curates your “news feed”. FB promotes posts that have likes, comments or shares, or which are from people you have previously interacted with. The posts from friends with whom you have not interacted much gradually vanish.
Thus, FB’s curated news feed hides much from you while promoting items that, as a side effect of their algorithm, are likely to be sensational or causing outrage resulting in more interaction.
Company researchers discovered that publishers and political parties were reorienting their posts toward outrage and sensationalism. That tactic produced high levels of comments and reactions that translated into success on Facebook.
They concluded that the new algorithm’s heavy weighting of reshared material in its News Feed made the angry voices louder. “Misinformation, toxicity, and violent content are inordinately prevalent among reshares,” researchers noted in internal memos.
Many groups – such as political groups and those operating as propaganda arms to persuade others to adopt their position – figured this out and intentionally posted more provocative content in order to get their posts seen more widely.
The effect of Facebook and other social media “curation” is to promote a culture of outrage that feeds upon itself, creating still more outrage and divisiveness. This in turns leads to more and more angry people, and eventually spills over into real life confrontations and protests. Facebook has publicly denied this is their fault, while their internal documents show they’ve known about it for a long time.