Going fwd, with exchanges if you unsure of who the owner is and you want to trade, withdraw your trades back to your personal wallets on completion, it's getting rough
out there atm.
Actually, one should always withdraw the majority of their funds from an exchange, regardless of the whether the owner of the exhange is known or not (reference to Mt Gox)
Those service are
not intended to be used as an online wallet like some people seem to think.
At the end of the day, the biggest part of your funds should be saved in a secure offline wallet. That way, nobody will be able to touch it.
Let this be a lesson for all of us.