Sandy, here are the answers:
1. Silent Cakes – these are cakes which don’t have any comments yet.
2. Most Discussed – cakes with the highest number of comments.
3. Top Cakes – cakes with the highest cake score(secret formula that takes faves, comments and views into account) in last 30 days
I hope this helps.
-- Michal, http://cakesdecor.com | My Facebook: http://www.facebook.com/michal.bulla