There is no doubt that steemit is doing a great job but along with it success, mobile app like esteem will encourage the mobile lover to use their extra time for some earning. On the top of that, busy.org, chainBB.com, and uTopian.io are great as far describe by you. I found esteem fabulous as I am its user but now by your post, which let me try others too.
RE: 4 Steem Powered Platforms That Can Be Used As An Alternative To Steemit.com