There was a recommendation system in place, 4 or 5 years ago, before even sub-reddits were introduced. The problem was that the recommendation engine wasn't ver

There was a recommendation system in place, 4 or 5 years ago, before even sub-reddits were introduced. The problem was that the recommendation engine wasn't very good, and that it was resource intensive as you suspected. For a long time there was talk about re-implementing it, but it's never re-appeared. I guess that's down to their growth rate and heavy reliance on cacheing. Still I would love to see some sort of discovery mechanism for sub-reddits. The tools reddit provides for casual discovery and management are just laughably poor, but I suppose it's down to priorities a staff availability.