IndieWeb sometimes feels pretty stream focused.
However, FedWiki came out of one of the early IWCs, so I guess it's always been a thread!
Plus I'm pretty sure it was through Wikity somehow that I first heard about IndieWeb.
Lots of the IndieWeb whys apply.
2 Building blocks
They definitely apply to the stream for a lot of social stream stuff. Microformats, webmentions.
I'm not convinced about the need for web actions to copy material from wiki to wiki. I'm doing manual til it hurts here, and it's pretty painless. Though doing a webmention for letting people do back links if they wanted could be interesting.