Seriously? You've never heard of it? There's a lot that it is, I'm too lazy to tell you. Just look it up. Basically, it's a mad, villainous bill that the U.S. Senate is currently in Debatte about passing. If it is passed, it will extremely restrict Internet freedom and its flow of information ridiculously. This is so serious, it's the first time the Wikimedia foundation has ever staged a protest. If it is passed, Du can KISS the Internet Du knew goodbye. This is what the Mayans predicted in 2012.
SOPA stands for 'Stop Online Piracy Act'. It's something ridiculous that the U.S. Senate is debating on, which is censoring many sites on the internet.