Federated wiki devs & users talk about sites as dat files and other schemes to selectively share. Video chat starts in 15 min. https://hangouts.google.com/call/vh8qSgMVs-k-qOFdtwDAAAEI …
On dat and dat doc. Best bet is to see Paul's dat repo. Here he pushes the latest client. Development is ongoing, you can install the client and configure it to work with existing wiki federation.
Paul demoed dat.
To persist when you are not online. Currently you'll need the hashbase.