Filter lists by other lists
Sort of to create the inside of a venn diagram between two lists, so I can see the overlap of one list in another list. (Lists have to be personal or liked to show up as filter option)
This would be cool because you could overlap your watchlist with a friends watchlist to figure out what to watch together :)
Fran Glean commented
Even if this was just an option when creating a new list, I'd love this so much.
Ideally a community tagging system (like the one used on Steam) would be better, as then you could just do an advanced search for films with certain tags. But this would be a good first step towards a solution