"post 4 times a day," hah. I am fine if I even manage to do 1-a-day. :D
But Steemit is on its baby steps. There are less than 1 million users here and active users number is even smaller. Imagine if every of your facebook friends joins steamit say in 5 years. Then eventually Steemit will look as flooded as your facebook wall today.
It's already a bit flooded, but atleast not with random crap. And even if my friends would join, that doesn't mean I should follow them for no reason other than them being my friend. I guess you could make the case you can also curate your facebook feed by unfollowing a lot of friends that tend to only post shit on a constant basis. BUT fb also shows a lot of "X person commented on Y" and "X liked that" etc kind of posts that are totally useless.