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There's no way that's going to happen. Facebook is one of the biggest sites online and it's hard to believe that it can be touched one way or another.
Yet they were able to mess around with paypal, and a few other major corporations. I doubt they can hack facebook. These people do this for laughs, nothing more. They don't care about facebook having our private info or anything like that. And why would they announce the date they would try to hack facebook? It's as if they want to fail. But yeah, I wouldn't worry about it, nothing will come of this.
Unlike US organisation, Facebook is a company of hackers, lot of them. It can be a great hacker war or it can be a child attempt. Let's wait!