I absolutely believe that social network advertising potential has only barely begun to be realized. These moves by Facebook and MySpace advance the ball.

But I am much more interested in new business models that leverage good old fashioned commerce on these sites. Buying stuff. Recommending products, and heck, even supporting causes with real currency, not just piles of pixels. Beyond the rich user data available, it is even more appealing to leverage the way real-world communications, gift-giving, and general interactions are being reiinvented on social networks. Social networkers are actually among the most statistically active e-commerce participants. They are teenagers (and older people) who are indeed pulling out credit cards and cash. They just don't yet have a way to do it in the company of their online friends.

Good points!