While previously hardcore members' use may be topping out or even declining, I expect that overall usage has increased enough to offset that --though I haven't seen any confirmation of that anywhere.
There's some FB soul-searching on reddit now, probably driven by that UK article. Pretty much sums it up.
top answer:
I used to think it would go into the "MySpace Cycle" where every post you saw was "Like this if you hate racism/cancer/mail fraud!" or a game request. At that point a lot if users would move on, and then eventually everyone would migrate to the new site. While there are a lot of those posts, I think Facebook has become too deeply integrated into our society to truly die out anytime soon.
For instance, after family events my aunts/uncles/cousins now share all the photos through Facebook. Because it's easy, and every one of them has a Facebook. Until a viable competitor with a compelling improvement over Facebook arrives, I don't see it going anywhere anytime soon.
2nd:
I think, like many people have said, Google+ is (theoretically) a great competitor to Facebook. The problem is there's no incentive to switch over. The majority of people aren't Google/Facebook fanboys, so the method (website) in which they interact with their friends doesn't really matter. And since everyone is on Facebook, why would they change to Google+?
I think Facebook is too huge of a company to mess with right now, and Google+ didn't come at the right time. I don't see Facebook going anyway anytime soon, especially considering how they are constantly "improving" to stay current. MySpace got stagnant which made it an easy target to attack.
http://www.reddit.com/r/AskReddit/comments/16jqgk/is_facebook_dying/
