I think you guys are so adept at SEO that you couldn't accidentally screw that up if you tried. Hell I tried to google 'realized networks' to contribute intelligently to that part of your discussion and one of the front page hits is +Mark Traphagen
from two years ago simply 'realizing' that he hadn't eaten dinner. That stuff is in your DNA. Focus on these other critical pieces.
C's vs. B's - It's all the same, mom.
I'd start with the end in mind. Let's imagine the end point is simply a customer. For B2B sometimes we get wrapped around the axle thinking it is some magical new beast. There is still a C, even if it is disguised as a B. So the "end in mind" for B2B may point us to the second B or to the second B's end customer.
Know thy Customer
For this exercise (as best I've wrapped my head around it so far) - there are plenty of additional steps I won't take time to elaborate on here. But in my simpleton layout below there is a piece of the value chain that stands out to me in terms of value to the system for B2B --> Step 4:
1 Make content crisp, and clear so we WILL READ it.
2 Make content great so we WILL SHARE it.
3 Make sure we can find it so we CAN SHARE it.
4 Make it valuable to MY customer (not only yours)
As the second B - I
want to be perceived by my customers as a valuable resource that they can return to with trust. Perhaps more so than in a typical social network, as a Business I would be looking for a Network to help ME be that resource.
The network constraints (either by design or grassroots) will shape how participants craft those messages, how they plant the seeds, how they find crafty ways to integrate dual messages and ultimately how they partner within the network to make it a success.
As for the UGcontent vs Social shares - to me it's a knit fabric. There is probably a default order to attack them in, but if one part breaks down the *system will quickly unravel.
Thats all I've got with the limited context, but you have my ear.