Google is harnessing communities with Google Co-op, a concept that lets users contribute their knowledge and expertise to improve search results for everyone.

How does a community get involved? This is how Google's Seth explained it. First, if you want to participate, go to Google.com/coop. Sign in and create a profile and a label. For instance, if I want to make a page about travel in Napa, I might label it "Travel in Napa." Then, I could put all sorts of information in that page.

If I want to create a page about Hawaii and throw in a bunch of information from searches I had conducted in the past, I can create a page and label it Hawaii. Others can contribute to that page and others can subscribe. The more subscribers, the more relevant my page becomes.

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