Must have pissed off Anonymous somehow. Everyone knows that they are responsible for all hacks.
HACK THE PLANET
Its more likely to be Something Awful who hacked it. Because MP was an idiot and challenged them.
Eh lay off the pipe. Nobody hacked anything. Some neckbeard that
can't read figured ddosing the mpex.co domain may do anything. MP redirected it to the White House as a lark, they've had their lolz on irc over it and all that. MPEx still trades, for one, the domain doesn't matter, for the other.
Take this as a sort of security drill: MPEx is untouchable.