In my opinion in upcoming years numbers of Facebook will going to decrease because as we know that Crypto Sphere will going to take over and there are many opportunities where users getting rewards for their efforts and in contrary Facebook is not giving inreturn anything.
Steemit is going through it's infant stage and for sure gradually it will grow because already on Steem Blockchain so many Dapps are running and the number of Dapps are increasing on regular basis so the growth aspect will not go anywhere.
Now just we have to wait for the Hardfork and SMT's and then it will going to prove as game changing aspect.
Wishing you an great day and stay blessed. 🙂