Comment by darth_avocado

Yes it’s a negative feedback loop created by the very bad product decisions they made to optimize for local maxima of getting more ads revenue. You inject more and more ads followed by more and more suggested content, thereby reducing the in network content. The in network content doesn’t get as much of traction, therefore people stop posting. This in turn forces the feed to have more and more suggestions and a few stale in network posts from days ago. This drives engagement down from people who want to see in network content and they leave. So what is left is people who do engage with suggested content, pushing the product to make decisions to push even more suggested content. All of this continues till eventually fatigue sets in and a sudden rapid drop in engagement kicks in because your global maxima of a quality product was lost long time ago and your product dies.