The clash between Oakland police and Occupy Oakland protestors was actually an example of a flash mob.
Quote:
Summoned by waves of emergency tweets and emails, fresh recruits joined the evicted Occupiers and early this evening once again marched on downtown Oakland, intending to reclaim Frank Ogawa Plaza.
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They were basically using the Internet / electronic / digital media to congregate in an illegal way.
The city has a proceedure for people to follow for staging a protest, these Occupy Oakland protestors did not follow that.
But anyway, it was an interesting use of the Internet to coordinate their activities. They just happened to choose a bad target to occupy - one that already had a large and well prepared contingent of "riot" police present.