Tor even more so, the power of Tor is that the more people use it: the stronger it becomes to centralised adversaries.
The main issue with Tor is the performance of it though.
I host IRC on a hidden service, and even Facebook (lol) offers a hidden service endpoint.
All that is needed is for a critical mass of people and a decent index: and we successfully have reinvented "the wired" from Serial Experiments: Lain
Tor even more so, the power of Tor is that the more people use it: the stronger it becomes to centralised adversaries.
The main issue with Tor is the performance of it though.