Phil describes Prabhakar Raghavan’s keynote about Web N.0 in some detail (at WWW2007), including the following framework for thinking about user-contributed metadata.
User-generated metadata is growing. Anchortext and tags are growing at the rate of 100 Mb/day. Pageviews are around 50-100 Gb/day. Reviews and ratings are small. All of these, are important, but only anchors are central to how people work on the Web.
START metadata:
* Star: I like this
* Tag: creating tags on pictures, etc.
* Access: you view a page (in a way I can see)
* Routing: forwarding things to friends
* Text: write a review, blog article, etc.These are in order of increasing engagement.