Re: 'The reality is people are leaving FB in droves'
Agree with AC.
"People" aren't leaving in droves. I'm 35 and don't think I know anyone without a facebook account. The wife and her friends arrange their entire lives by it pretty much. Even mates who work as things like policemen and nurses have FB accounts, sometimes with a modified or truncated name but still, they're there.
YMMV, and anecdotal evidence is anecdotal, but equally as anecdotal as claiming "droves" of users are leaving. I'd imagine the opposite is true. People are signing up younger and younger.