Not really. It's still growing in users and it still is by far the most used social networking site. Is it as much of a phenomenon as it was in, say, 2009? No. But it's still bigger than any other website. It is, as of this month, most used website worldwide, ahead of Google.
I don't think so. And even if it did it is still strogly at number one with no competition. Twitter is too simple to endanger it, Myspace is dead and Google+ is flopping. Tumblr and Instagram are getting bigger but still nowhere near FB.
I don't like spamming so I'm still using Facebook. Not sure about WW, but a FB account is like a must here. It's one of the top reasons people buy internet.
It's still growing in users and it still is by far the most used social networking site. Is it as much of a phenomenon as it was in, say, 2009? No. But it's still bigger than any other website. It is, as of this month, most used website worldwide, ahead of Google.