I used it, but these perhaps will help you better

• https://en.bitcoin.it/wiki/LakeBTC
• http://www.coindesk.com/huobi-lakebtc-added-coindesk-bitcoin-price-index/
• http://www.coindesk.com/lakebtc-users-bypass-bank-transfers-ripple/
• http://www.coindesk.com/lakebtc-exchange-launches-browser-based-bitcoin-trading-app/
• https://bitcoincharts.com/markets/lakeUSD.html
• http://bestcoinexchange.com/exchanges/lakebtc/

I think that TreaExchange is the sole legitimate currently.