The article mentioned MySpace. I'd add AIM which was killed by SMS.
I remember a time when every other teenager had a Livejournal blog.
Blogging is still quite popular, just in a different form and platform. Whatever you might have shared can now be shared as a FB post, Tweet, or Tumblr.
And now that platform have shifted to Snapchat, but FB, TWRT, YHOO are mostly still in business.