Please be wary -- the meteoric value of this concurrency doesn't have legs..
Take a moment and look at the the volume of other cryptocurrencies here: http://coinmarketcap.com/currencies/views/all/
Note that Steem has the lowest volume:price ratio of the top 10 cryptocurrencies by a huge margin.. It jumped by over 150% in value, or an appearent increase of well over $100,000,000 on a meager $770,000 of trading!!! It suddenly exploded in value because it's gained significant interest and for now there are more buyers than sellers on the markets, which has created an artificial supply shortfall.. As sellers start transferring funds and cashing out and interest wanes, and it'll implode.. Just look at the market depth (order book - set price range to 100% or all): https://bittrex.com/Market/Index?MarketName=BTC-STEEM
Be warned -- not a good time to buy!!!