Your links are mostly before the privacy scandal. So how can it relate to that? Facebook’s stock wouldn’t be a few percentage points away from all time highs again if things were this bad for them (of course we won’t know for sure until next earnings report).

Teens don't want to use FB because it's the same platform that granny is on. "FB is for old people" trend has been going on for years. It has little to do with the recent news.

But to automatically say it has anything to do with the latest news is like all of the "stock analyst" who claim after the fact to know "investor sentiment".