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The hacker is reportedly a well-known “white hat” hacker, which means he uses his knowledge of the darker arts of hacking for ethical purposes – such as security.

The hacker known as Chang Chi-yuan has spoken previously about using hacking as a way to earn money, and as Facebook offers a bug bounty program where details about any bugs or flaws in their system are rewarded, this is almost certainly an extension of that.

The event is supposed to take place at 6 pm on Sunday local time, which translates into 11 am in London and so 3am/6am on the west/east coast.