the ad that started it all
Read this Wikipedia entry for a history of the Occupy movement.
And this NPR radio story about Adbusters, the Canadian magazine that started it all: "The Occupy protest seems to have come out of nowhere but the early participants like John Garcia in Seattle point to a specific catalyst: "I get Adbusters, so that's how I heard about it." Adbusters is an anti-consumerism magazine based in Vancouver British Columbia. This Summer it proposed a September 17th occupation of Wall Street and the idea caught on. Adbusters doesn't claim any control of the protest and it wouldn't give NPR and interview because it doesn't want to overshadow the movement. It sees itself more as an idea shop."