I framed my question inadequately, you're right (even though that's not what you said 
). 
I think that individual organisation could create public IC diplomacy threads/subsections within an IC section for voluntary usage of pilots from various organisations, where people with business could come forward.
I also think you could have IC bars and IC follow on stories relevant to ongoings ingame (similar to 'we stop this broadcast' on IGS).
How does this differ from IGS today? That's a genuine question, not a veiled criticism implying that it doesn't. I just feel like I don't quite "get" it, that's all. 
That's easily understable, the OP was written in very general terms. I'll put ideas into bullet points to answer your questions.
Question: How does this differ from IGS today?
1- Access to roleplay. You can create specific sections of a forum for formal semi-public diplomatic contact. This is the kind of contact we try to create with public channels ingame, which I believe is inadequate. It eliminates timezone and activity problems - which to many degrees limits the quantity and quality of interactions that end up happening in my opinion.
2- Quality. Mods can filter out OOC riffraff much more easily and according to better standards.
3- Variety. One can create IC venues (even OOG extensions of IG ones), themed to the user's wish (e.g. someone asks for a section to be created where certain IC discussions are held, e.g. Heiian society area). This can act as a vehicle for promoting & publicising new RP interactions and ideas.
4- Recognition of the silent. The problem with IGS is that good threads that progress slowly +/- get bumped away by attention whores . The current face of IGS is a proverbial ugly 'pizza', a mobbish venue where so many unwanted ingredients are shoved right in your face. Drama threads unrelated to your own drown you out, such that if people wanted to know what the current (insert faction name) activites/public threads were, it becomes very laborious and difficult to reference if looking at past trends. People should not be forced to resorting to bumping their own threads to keep them current.
5- Communicating with CCP. Such a development can signal to CCP what the players want in a very powerful way if the place of choice for RP to occur is external to their own website. Let's be frank, many players do not like using IGS as a vehicle for communication for a variety of reasons and it does not seem to have improved. If the quality concentrates external to it, I think CCP may take measures to improve IGS and attract us back. We win in either scenario.
