Impossible. Facebook has 2 bill active users. It helps to keep in touch with your friends and family and share personal updates to your circle. steemit is a blogging platform like redditt. Redditt has 250 mill users. Folks are trying out steemit for the opportunity to make money for their content and the buzz on blockchain. As a platform unless there is an incentive to new users, it will be hard to continue the pace of user growth. Steemit will grow but similar newer block chain content based platforms will get started.