I wrote a small plugin for ssb that allows it to read through posts to discover dat links and seed them automatically. The cool thing is that you can tell it to only seed for people you follow. Besides the normal use case of a user only sharing friends links, this also makes it really easy to set up a pub that automatically seeds content shared by its member. This combined with something like beaker browser makes it easy to create content and share it in a totally distributed fashion.
The best part is that it is only 100 lines of JavaScript.