Goodreads Librarians Group discussion

I've been poking around Recommendations. I made a couple in answer to some people's requests.

But I can't determine where those images of Recommended books based on our shelves come from. They don't seem connected to the long lists of people asking for recommendations. And "make recommendation" just seems to be a general shout-out to everybody, although I could be wrong about that.

Is there, somewhere, an "if you like this you might like that" sort of thing whereby those recommendations are made? How are they generated?

This is a question for the Feedback group.