This looks like a PR move, nobody knows their algorithm. Similar situation to Google, what comes on top of the stream? I mean you pay to manipulate it, so there

This looks like a PR move, nobody knows their algorithm. Similar situation to Google, what comes on top of the stream? I mean you pay to manipulate it, so there is no neutrality to begin with. The paid concept is flawed, think about it: You follow 100 Sites/Friends nobody promotes their post. Now everybody pays to promote their posts for the same amount. Stream looks exactly the same. So Facebook obviously hopes for a race to the top here where everybody pays more to stay up. Great idea, it will depend on CPA in the end anyway. Seems way too expensive right now.