Great article Scott. I've been thinking about this a lot and there are countless fantastic applications to semantic web technology - especially for marketers. I couldn't help pondering some of the other implications either http://watsonneil.wordpress.com/2010/08/17/sleepwalking-in-a-social-media-nanny-state/ I do think it is absolutely the job of marketing to take ownership of the opportunity, it's going to be interesting.