I wonder if there is a place for search by metaphor. For example, consider the following:
- techmeme for skiing : I want new stuff about skiing, ranked by attention from skiing peeps
- youtube for opera : I want video on all things opera and a dedicated community
- facebook for pets : I have too much time on my hands (actually, there is an app on Facebook called Dogbook...)
One of the distincations that will come in to play as search evolves on the web will be a lessening of a reliance on useful bit opaque mentions (that is to say, these scenarios will only work if someone actually referred to Dogbook as a 'Facebook for pets') and more of a reliance on actual derived or inferred facts (which requires an understanding of what type of thing Techmeme is and how to recognize that type of thing elsewhere).