Flash Mobs is a term which has caught hold of our fascination recently. Wikipedia describes Flash mob as
flash mob is a group of people who assemble suddenly in a public place, perform an unusual and seemingly pointless act for a brief time, then disperse, often for the purposes of entertainment, satire, and artistic expression. Flash mobs are organized via telecommunications, social media, or viral emails.
So how do you know when and where the next flash mob is planned. It may appear that flash mob is generally unplanned but the fact is flash mob is well coordinated gathering.