On Sun, 30 Dec 2012 05:03:40 -0800 (PST), Jonathan Banquer
wrote:

What advantage does Linkedin have as a host for a discussion group compared to
Google Plus?

LinkedIn is a professional networking site. It has been accepted and
is used by professionals who wish to network far better than Usenet,
Google Plus or advertising driven machinist / CADCAM forums will ever
be.

How does a hobby group such rec.crafts.metalworking fit into this business to
business model? To me they seem like separate worlds.