I really don't understand how any of these things work, if they even work
But I am a firm believer in not inundating readers with incessant posting. I try to keep it to one post per day. I have "un-liked" quite a few fb pages because I was sick of the constant postings.
Personally I am not happy with the relatively few responses I get to some of my postings but there is always a response and I make dang sure that I immediately answer it by either clicking "like" or with a verbal response.
I used to share occasional posts from other businesses in the area, for promotions sake, but largely refrain from that now because very few do it for me..