I mean, points on Google being a broader, more innovative company with a larger vision are well taken. And Facebook is still the college dorm room social networ

I mean, points on Google being a broader, more innovative company with a larger vision are well taken. And Facebook is still the college dorm room social network. But it's hard to see how a site with 1.1 billion global users will shrink to irrelevance any time soon. Even if it loses 600 million of those users, 500 million people are still using it. Facebook is not doomed by any stretch of the imagination, unless I'm not seeing your definition of 'doom.'