Real time conference blogs

I dug this up from an older issue of the Economist (7 August 2004, "The new networking: How to network between coffee breaks"). Imagine that you are speaking at a conference and the live blog projected right next to your presentation slides suddenly reads "what a load of nonsense... you'd better step down before it's too late", the message having been posted by a member of the audience you are overlooking!. It's actually happening. And I think it's a good thing and will probably catch on.