Mr. LEE: We had, like, the three of us and a ...(unintelligible) player and a singer and an Arabic belly dancer, and we were doing the rave scene around in Scotland and various other parts of England.

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Inside, a belly dancer performed live, and a DJ spun '80s and contemporary music while Yelp's 2, 000 guests--mostly folks in their 20s and 30s who are fans of the site--danced and ate finger food prepared by San Francisco restaurants.

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All eyes are on the woman in the centre, who gyrates to the rhythm wearing an outfit that is part punk, part belly-dancer: nose-ring, five-inch platform boots, ankle bells, black bodysuit, sequinned bikini top and a flowing pink skirt.

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One of the most typical movements is the famous belly push, the umbigada, a testimony of Bantu influence, used by the dancer to invite her successor into the centre of the circle.

UNESCO: Intangible Cultural Heritage