One day soon we might all be wearing glasses that will tag our world while we look at things around us.

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The company also tries to build up huge communities of interest through massively aggregated individual efforts like the online photo site Flickr, where people post and write about their photos, or del.icio.us, where millions of individuals "tag" their favorite Web sites, establishing a collective sensibility about what's good on the Web.

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Jessie J burst out of a giant safe to deliver her song Price Tag and at one point, a streaker bound on to the stage and exchanged words with US actress Hayden Panettiere.

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