Hackers hit web accounts of MtGox boss
The attack on Mr Karpeles seems to have been motivated by growing frustration over the actions of MtGox.
Last month MtGox stopped trading and filed for bankruptcy after finding out that $465m (£279m) in bitcoins had been lost via a security bug.
Many have called on the exchange to release more information about what happened to the lost bitcoins.
The attacks were mounted on the personal blog and Reddit account of Mr Karpeles and left the hackers in charge of both social media accounts.
The attackers used their access to grab detailed information about trading activity at MtGox. They then shared their findings by posting a 716MB file containing much of what they had found.
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