All these are great ideas, but it's actually kinda funny how obvious a subject-subscription layout of some kind - any kind - should be a thing. Much of the mainstream websites offer this, from Twitter to Linkedin, wordpress to minds.
People don't want to browse through random shit for an hour to find a couple of things of interest. People don't want to be told what they might want without any prior context. Even facebook, wechat and Windows 'learn' what you like with experience watching your every move.
I want to join Steemit, meet like-minded people and read things that I personally find intriguing... it's not that hard =/