Omar Sider of Arlington, Va. hired a flash mob to surprise his girlfriend, Star Morrad with his proposal for marriage in Georgetown Waterfront Park.

Why do they do this? Just for fun. Flash mobs are also organized on the spot for political rallies as soon as some controversial event takes place. The flash mob is quickly organized by email ...

Samsung Hong Kong has teamed up with local celebrities including Denis Kwok, Jeffrey Ngai, and Sica to perform a flash mob as part of ... and social-content worthy engagement, to foster brand ...