Facebook is declining. That is true. I see less and less posts from my 'friends'. Maybe they have moved on to other venues. And I can see the appeals of sites like Steemit. You get rewarded for your posts. Although it may not be easy, it is an incentive. You are already posting on FB anyway, and you get nothing for your posts. But I think FB will still be around for a few more years, albeit less popular and lesser users. It is still a good place to keep in touch with family and relatives - stuff like that. Unless, Mark Zuckerberg turn FB into something like Steemit. Anyway, we shall see.