RE: Will Steemit replace Facebook?
There may be some comparisons and variance between steemit and facebook or other platforms. One can actually take a position as to both platforms being the same or different in terms of its designs or functionalities. The fact remains that these platforms were designed for information sharing, use, and a whole lot more.
The rivalry between both will arise as a function of which platform users are more interested maybe based on its rewards systems.
However steemit might experience a longer growth and expansion rate if facebook embraces the blockchain technology with similar incentive like steemit, since they already have wider coverage and user base.
Otherwise Steemit would experience a take over of a larger market share of users over time. However the onus is on steemit to develop more features just like @infobunny suggested.
Every platform is unique but the most important is the market share. In conclusion steem would have more larger market share if status quo is maintained by other platforms and steem keep improving and inventing new features and designs, their business model would be the game.
Change is never spontaneous.