Having an author page on Facebook it's easy to see they do this. A fraction of the people who have liked my page see the posts, even less if there is a link from, say Amazon. If you pay them they will make your post visable to a wider audience... even though that wider audience is probably people who have liked the page in the first place.
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FB pages are officially the black hole of the internet. Groups are much better for interaction. They want us to Pay to Play.