Over $109bn wiped off Facebook's market cap after growth shock
theguardian.com
theguardian.com
They've fallen and recovered from way more than that (edit: not) this year.
1: https://www.google.com/search?q=%24fb&oq=%24fb&aqs=chrome.0....
It was an open question whether EK could recover. We all know how that ended.
Just because something happened doesn't make it news.