I really think that you could use Steemit to get the word out. You could have a blog, or a series of how-to articles, about bitshares. Then you could refer friends or anyone to your blog. I think that if the blog was organized in a user-friendly manner (i.e., going from "What is Bitshares") to more advanced topics (anything from the delegate system to margin trading... the sky is the limit here), it would be successful- and earn you Steem Dollars, as well! Steemit and Bitshares are very much tied together... and EOS is right around the corner. Best of luck!