For me, it was the mobile interface interlaced with so many video ads that killed my usage. I do open the app sometimes to check what some of my distant friends post, but my usage has drastically gone down. I think 5 years back I spent at least 30 mins on the app every day, now I don't even open it on a few days. To top that, the Cambridge Analytica incident.

That said, I remain invested in FB, since my hypothesis was that 'a majority of people are not like me'. Looks like I am being proven wrong, but let's see the long term impact.