Sort:  

woah.... greater exposure for STEEM.... more platform for exchanges thumbs up

It is the largest volume altcoin exchange. Getting on poloniex opens Steem up to investors with real money to invest and drive the platform further.

Ohh!
And why there is so much rate diffrence between bittrex & poloniex?
I saw people buying from bittrex and selling to poloniex, makes 5% profit.

Standard occurrence upon the opening of a new market. It takes time for people to arbitrage to the current market value.

Thank you for answering:-)

Always. Have a great day!