Everyone talks about authenticity in social media (that somebody wants to see "real" content from "real" people) which really makes sense because it is the most human thing. But what if the bots pass a Turing test and deliver relevant content with said links? Does it not become spam anymore? That's the weird part. All of the spam I get in my email I don't want because it is completely irrelevant. Same goes for ads on nearly every site. That's why it's spam: I don't want it, it's being forced on me, and is completely irrelevant to my productivity. But if some bot dug up something cool, isn't that just what gets defined these days as "targeted advertising"?
The utilitarian argument here invalidates this premise of the pins needing to be human, which is what is interesting. If you are getting utility out of it and you didn't know it was a bot, you are actually still better off.