This last link relates to my questions about if those likes are really "likes" not some kind of automated response that FB creates. I witnessed that when someone comments onto posted link, the page on that external link gets one more like. That's not real like for me.
For me, running paid ads for likes is like buying likes, and that is like buying links, spam, even if it goes through FB itself only. I still don't get this. I hope that Google simply may discount it, not punish as that would cause a lot of pain to many people.