The huge difference between Fb and Steem is: 'maintaining old relationships' vs 'building communities/new relationships'. So I don't think Facebook and Steem are replaceable yet, except if everyone starts to come over so to say. But most won't. That's why I believe we shouldn't even try convincing our friends, but we should try to convince the micro-communities we're part of. Since those might actually survive and even thrive from moving from Fb/other media to Steem - look at WeedCash, the first 'SMT' on Steem - any community can do that now: build their own platform and share their own coin! <3 Exciting times.