(1) On every meetup I attend people are genuinely extremely surprised when I share with them even 1-2 of the screwups Facebook did. They are ENTIRELY clueless. And we're talking tech-savvy business founders and CEOs -- and often times CTOs and CFOs.
(2) Most don't care. They write it off as "I am not important enough to be spied on" or just directly admit "Facebook is integrated too much in my life and work and I can't replace it" and that's the end of the discussion. Many even say "they have only a part of my data, they can't have it all, right?" -- and have no idea about how well the tracking industry does cross-referencing of seemingly unrelated data sets.
I don't think Facebook is going away anytime soon in any measurable way or form. Sure they might struggle monetizing their mountain of data and analytics, and sure the stock market circus might not be on their side right now but I can't see them actually losing a significant chunk of users in the next 5 years.