mobs

A flash mob (or flashmob) is a group of people who assemble suddenly in a public place, perform for a brief time, then quickly disperse, often for the purposes of entertainment, satire, and artistic expression. Flash mobs may be organized via telecommunications, social media, or viral emails.The term, coined in 2003, is generally not applied to events and performances organized for the purposes of politics (such as protests), commercial advertisement, publicity stunts that involve public relation firms, or paid professionals. In these cases of a planned purpose for the social activity in question, the term smart mobs is often applied instead.
The term "flash rob" or "flash mob robberies", a reference to the way flash mobs assemble, has been used to describe a number of robberies and assaults perpetrated suddenly by groups of teenage youth. Bill Wasik, originator of the first flash mobs, and a number of other commentators have questioned or objected to the usage of "flash mob" to describe criminal acts. Flash mob has also been featured in some Hollywood movie series, such as Step Up.

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