Here’s what I said:
One of my fears of recommendation engines is the end of finding search gems I wasn’t looking for. These engines are typically built on the idea of that people who did X, bought Y and therefore “think like you”, so you might be interested in what they are interested in. This is effective in building community and connections with like-minded people, however, some of our true discoveries and learning come from being connected to people with different views and different interests. I’m not sure how/if these connections can be made by recommendation engines. I’ll throw this out to developers to consider.