I can't see that working for anything other than niche networks. A social network will make less money doing this, so what's their incentive? The bulk of people will stick with a network that gives them constant and instant feeding of their addiction. I think the "vaccine" would need to be broader to be effective or major networks would need to grow a serious conscience.
I'm very curious about niche networks. I have hunch that ravelry.com has something to teach us. I bookmark any niche networks I hear about, like pray.com. Hope to someday do a survey, feature comparison, and whatnot.
I hosted a very niche BBS network. Think The Well for CAD and computer graphics. True, there was no business model, but it was awesome and fairly long-lived.
Facebook is now fairly long-lived. All of its predecessors eventually perished. Some day Facebook will too. I'm curious what the successors will look like.
