Hmm. But isn't the internet/new media heavily balanced towards the 1-way communication model ? Does sharing, re-sharing and commenting in the void qualify as 2-way or m2m or is it just an amplifier ? The potential is here but does it really solidify into existence for the vast majority or is just for the vocal groups (NGO, journalists, lobbyists, etc.) ?
I have in mind the net delusion  and the submarine model .
as an aside, what are we doing right here, right now? HN uses the internet as a print medium. As a blog it is 1:N, and as a discussion forum is N:M. So yeah, it's complex :)