Will Communities Bring the Next Revolution in Search?

Bambi Francisco seems to think so. She writes that communities can help determine relevance by revealing information on what people consider useful, and hence large communities like MySpace are uniquely positioned to be a dominating force in the search business.

I'd argue that on the Web, global communities based on shared interests are actually the newest forms of clustering audiences for advertisers.
And, where are a lot of these clustered audiences being formed? MySpace.
Hence my original question: What if you layered the social network of MySpace's 70 million-strong members over search results to get even more relevant results?

A clearer example of what Francisco is referring to can be seen in the startup search engine PreFound, about which she writes:

On PreFound, if you create the page and it's useful to the community (in other words, the page gets a lot of clicks), the more advertising dollars the page creator receives. You can think of this page creator being similar to the guides who write short pieces for About.com. The difference is that on PreFound, these guides are found in a search paradigm.

Will communities bring the next revolution in search? Or will spam still apply with equal strength and distort relevance as it does in current SERPs?

via Clickety Clack