never saw it replacing Facebook, but Reddit on the other-hand... well now that's a different story. Although, they have a ton of work to do, and I really don't think the powers that be even give a shit.
Hell, why aren't witnesses putting out ballot changes that we can vote on to get the changes we want. Without any of that Steemit will just die.
Even though I catch myself comparing Steemit to Medium or Blogger slash a Reddit, when I really think about it I don't really get the Reddit comparison.
Reddit has a ton of subreddits so essentially groups, Steemit doesn't have groups. Reddit is also in a sense a Q&A site which encourages people to chatt and come back. I drop a comment, I see someone commented on mine so I come back and coment back. It encourages community and interaction and discussion and Steemit doesn't really have that.