Flash Mobs: Purposeful or Purposeless

Today in Participative Communications class a group of students and myself decided to create a flash mob for a class project. The discussion began with throwing out a bunch of ideas about what to do for our mob; but the question of purpose arose amongst some of us. Does or should a Flash Mob have a purpose or is just some random group of people doing random things?

I definitely stand on the side that a Flash Mob needs purpose and a message. What's the point of doing random things? A Flash Mob can be seen as a form of activism; and if it seen through that lens, then there unquestionably needs to be a message, purpose and intent. Grabbing attention not just for the sake of grabbing attention but for creating attention about a social or political message.