ListableL
Listable

Likes

Users should be able to like listings. It should be possible to sort on likes
PlannedPlanned

Would love to see this. Ratings and reviews, while great and should co-exist with this feature, can be a bigger commitment than a simple like. :) Likes are quick, friendly. Low commitment that even non-users or non-customers could technically engage with. I would add "comments" as a possible feature that compliments this. Simple comments allow for questions and discussion.