I don't notice my friends leaving and I feel like it's dying too. The content just feels so manufactured and empty. About 80% of my news feed is:
1) Friend X liked a photo of someone I've never met and likely never will meet
2) A recipe video that I would never make, or some household 'lifehack' I would never use.
3) Meaningless images - 'Happy Friday', 'Share if you hate winter', 'Like if you love Christmas', etc.
Their engagement numbers may still be rising, but it feels like they've favored pushing up that metric at the cost of having actual quality engagements. It's all been hollowed out.