Has someone ever used NethServer?
Yes, I did...an continue doing....
It's why I already doing with self-hosting communities... But self-hosters undoubtly prefer Debian based solution, the Debian social contract is really strong, but the main reason is the way to upgrade a Debian, really easy without necessity to reinstall.
To shake "social communities" with Linkdn, Twitter, Facebook... It could be a good thing, but I'm not a "social network" user, I really old-shool 