Check out Mashable's article, "Social Media’s Delusion of Grandeur."
Twitter is a newfangled party line filled with cross-conversations (check out "Pillow Talk" if you need to know more and if you're young enough that you never saw the Doris Day movie).
Eventually, party lines faded away. While there are still party lines advertised late at night to presumably meet "exciting" people, Twitter and its kind could be more successful and survive.
But I still understand it -- even as I use it.
Meanwhile, apparently, Gartner has a list of the top 10 disruptive technologies (the list is available here from the Oracle Fusion Enterprise Content Management blog):
- Multicore and hybrid processors
- Virtualisation and fabric computing
- Social networks and social software
- Cloud computing and cloud/Web platforms
- Web mashups
- User Interface
- Ubiquitous computing
- Contextual computing
- Augmented reality