Facebook's problem is very real. This is not like when Amazon's stock price nosedived after the dot com bubble burst in 2000. That was an industry wide event. This is a Facebook specific event. Compared to that LinkedIn is doing fine for now.
And this is about cold, hard cash.
Data mining is where the money is at for Facebook. More mobile usage is not bad news - quite the opposite - if data mining is the primary way you monetize. More engagement means more data.
Below $20 is the red zone. Facebook has already entered that.
How Facebook Could Save Its Shattered Share Price
Now as it plunges towards half its IPO value, it’s entering a state of emergency