Doug Engelbart the creator of NLS and famous for Mother of All Demos talks about such systems http://youtu.be/xQx-tuW9A4Q and http://youtu.be/VeSgaJt27PM etc.
The general principle is we won't make much progress discussing complex issues by simply recreating the print world with increased convenience of a computer like we do now. The discussions have to take a fundamentally different form, possible only on computers, such as semantic argument maps, etc.
Of course his perspective comes from 1950's when educated people had civil discussions that solved problems, or at least that's the modern nostalgia. He imagined a new class of "knowledge workers" moderating information. Instead we have voting rings and content farms.
If anything, a structured argument map could shut down much of the attention seeking drivel surrounding every political/complex system issue.