I was live on the site as it happened, live in a margin trade, when the site crashed. Twitter is going nuts, and the trends seems to be to transfer any funds to Bittrex/Bitfinex, if the site gets up at all.
I have been able to gain access twice to the site so far, but after a minute or two, I will land on a white page.
I suspect the mass exidus from Poloniex over the next few days will be it's ultimate downfall. Get out now if you're on it at all.