Some days ago when did some trading at Binance I've seen the BNB. I am also very interested in "hodling" some.
Unfortunately Binance does not trade SBD (but STEEM only).
I guess they will add it, soon. STEEM is also quite new at binance.
I have no idea if it is a good idea to by STEEM and exchange to SBD at steemit/market or better buy SBD at bittrex.
Sell some SBD for Steem, it's not worth using more than a couple dollars to promote posts. I find the best friends and follwers are made from comments and engagement