With regards to sharing views on products and personalized advertising, places like Amazon have been doing that for years. Rich multimedia content? Meh, I’m not sure if there’s a need for it in most online retail outfits.

Vertical social networks already exist and some have been successful. I don’t think we’ll see people signing up for smaller social networks in droves or that it will really have a huge impact.

Web 3.0 is much more likely, in my mind, to encompass the next logical technological leap: mobility. Broadband access everywhere, through the phone. Phones have that capacity now, but imagine being able to take social networks to the real world. Applications still aren’t mature in that area. Here’s an interesting related idea: I recently read about a technology being developed by MIT that allows people to tag buildings with their phones and build communities around them.

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