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Social Media Day flash mob -- Close to 500 people participated in a flash mob in New York City’s Hudson River Park for Social Media Day. The performance was the brainchild of tech startup Urthecast, which aims to provide the first-ever HD streaming video of the Earth from space. Surprised tourists waiting in line for Hudson River cruises were taken aback as the participants, clad in orange, ran to the boardwalk and started dancing.

Official West Side Story 50th Anniversary Times Square Flash Mob in HD! To celebrate the golden anniversary of the Academy Award winning film, DanceOn put together a flash mob featuring 50 New York City Dancers.

"Zorbas" Birmingham Flash Mob : Greek and Cypriot students of Birmingham, dancing "Zorba" in the center of Birmingham City.