Can you explain? Categories are going to evolve. If two people make 'my top 5 action movies' (and the category is 'movies') then they in a way grouped together. If you go to any list page you see comments for those people in your network about that 'top 5'. You can also click on a friends picture to see what their list is.
Sorry, I cannot view the site right now, because it is blocked. But, I was wondering how you combine several users' lists. For example, say there are action movies labeled A,B, ..., Z. Suppose 3 users have ranked action movies. Their lists are A-B-C-D-E, Z-A-B-C-D, and F-A-B-C-D. How do you combine those 3 lists to form a master list? I've looked into this before and was just curious what method you decided to use and why.
Gotcha. For now a simple COUNT of the items, GROUPED by top 5 ORDERED DESC. that works well if there are several lists. I think i'll eventually weight #1's higher then #5's to make it more accurate.