The Billboard Liberation Front practices culture jamming (a tactic used by anti-consumerist social movements to disrupt or subvert mainstream cultural institutions, including corporate advertising) by altering billboards by changing key words to radically alter the message, often to an anti-corporate message.
It started in San Francisco in 1977 as an outgrowth of the Cacophony Society, a secret society responsible for a number of anarchic pranks.
The Daily Omnivore 
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