"More than 1 in 4 American users have deleted Facebook, Pew survey finds"
https://www.washingtonpost.com/technology/2018/09/05/more-th...
And is there really a generation of new users ready to take their place? I'm not sure:
https://www.independent.co.uk/life-style/gadgets-and-tech/ne...
No tech company of this size dies overnight. And they might be diversified enough to be fine for a very long time (WhatsApp, Instagram) but these are very real problems for facebook.