Absolutely sure Steemit can beat Facebook if Facebook does not implement a convenient system of payment for posts. Once the interface Steemit will be more user-friendly and functional, Facebook will quickly lose its positions. After all, Steemit is a new idea, a social network of new generation. Similar to how Facebook (and other social networks) pushed out of the market instant messengers Steemit displace the "first generation" social networks.

Update: Wanted to leave a more detailed comment, but it turned out a whole post :)
https://steemit.com/steemit/@omfedor/why-facebook-will-lose-in-the-fight-with-steemit-4-good-reasons