Ask HN: What should I teach freshmen about Web 2.0 (and maybe entrepreneurship)?

I may have the opportunity to teach/TA a 1-unit exploration course at UCLA - the professor and I think Web 2.0 is a good topic to explore but I'm trying to find out what topics/case studies would be good to spark the imagination and future learning. I'm planning on calling in my friend who runs his own FML-type venture, if there's anyone in the LA area who would be willing to come by, drop me a line.