I'm not sure if this exists yet, but if it does, it would totally decentralize the internet. Being blockchain powered, its content would become immutable, making it difficult for any government or nefarious organization, to take control over it and shutdown the websites living under such system.
I've heard about Maidsafe, but recently found out that it was not blockchain powered. Still, it has interesting technology that might become useful once released.
What do you think?

The internet as we call it is a group of decentralized servers liked together and you really cannot restrict it fully even if the government wants to but everything you do online can be monitored if you are not securing the protocols and only databases of sites are centralized like google and facebook which is taking the anonymity away from its users and if anyone is able to build an open block chain based social networking site i will be happy to see those.