I really think that people behind mtgox and poloniex stole peoples bitcoins not hackers. Here's the story.
Quote:
Digital currency exchange Poloniex, which trades bitcoin and other popular digital currencies such as litecoin, namecoin and dogecoin, has lost 12.3% of its total bitcoin supply in an attack.
The exchange took to Bitcoin Forum on 4th March to report it had been compromised by a previously unknown vulnerability in its coding.
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Source:
coindesk