I just thought I'd point out this conversation I was having with Jim Bthis conversation I was having with Jim B (as transcribed into his answer from the comments on my answer) on SF as an example of something that would be perfect to have a "third space" for. The topic was interesting and germane to IT professionals, but fell out of the scope of an Q&A site.
I would have loved to have a place to continue that back-and-forth, hopefully with a way to attach it to the originating question - maybe a link to a transcript in the vein of "discussion moved to thirdspace.serverfault.com/path/to/transcript" after the discussion was done, and "Join this conversation at: thirdspace.serverfault.com/?id=xxxxxxx" while it was ongoing.