Just a heads up. Tried withdrawing BTC from Poloniex 2 days, then hours ago but can't. Sent a support ticket and all replies are that they are 'fixing the problem', but the problem keeps coming back and people can't withdraw.
Poloniex users, please be on the look out. Non-users, stay away for now until the problem is 100% fixed.
I wish i never made a BTC deposit and did more research about Poloniex. I wasn't aware that it was hacked last March 2014:
http://www.coindesk.com/poloniex-loses-12-3-bitcoins-latest-bitcoin-exchange-hack/
Poloniex Loses 12.3% of its Bitcoins in Latest Bitcoin Exchange Hack
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.
Writing under the username Busoni, Poloniex owner Tristan D'Agosta, moved to calm concerned users by explaining what lead to the hack, as well as what the next steps from the company would be.
Due to its current bitcoin shortage, Poloniex indicated that all customer balances would temporarily be reduced by 12.3% "out of absolute necessity". D'Agosta suggested that this was the only way that bitcoins could be distributed fairly among affected users.