The way Steemit is growing it will surpass Facebook and other social media platforms in the years to come in value and popularity. This cannot be gauged by number of users alone. Facebook has so many members not only because it has been around for a decade(as a first mover) but also because everyone needs to have an account in order to take a look at what others are doing!
Most FB users are not active for the reason given above - they merely lurk and gape at pictures and read what others have posted. Those who are active mainly post meaningless selfies and nonsense - reason why I stopped looking at Facebook.
There are a few useful posts here and there, more the exception than the rule.
Very few selfies on Steemit and anything that may come close to the nonsense that one sees on Facebook is just an effort by someone who may not be the most talented writer around but still wants to make it on Steemit.
Great post by Juliank, thank you!