(EDIT: Re-Created and updated Cobalt 8 topic)
This C7 topic is related to my older accepted feature request on previous ME support area.
Since you added a separate bookmark feature in "Cobalt", i am not sure if my new request belongs to bookmarks or favourites. Which one is more extendable? I think, it applies to both?!
Create multiple bookmark-categories. You might call them lists or collections of other items. In addition to a single flag, a user can assign the current item to a "category" or "label". Other users can see those collections.
IMDB.com - please, see lower right side bar for "Related Lists". To create your own lists, you might create a free account to test the functionality.
See button "Add to Favourite & Playlist"
Same function but used for user categorization. See popup next to follow button "Add/Remove to lists..."
Currently, there is only an option to change the bookmark ICON on template parameters. I can´t see any further configuration. I am not sure how "bookmarks" differ technically from "favourites" in cobalt. Maybe it is a little bit redundant anyway?!? Can´t both rely on the same code... For example: Do you know the Drupal module "flag". This can be used and configured multiple times. You can rename it and use a different icon.
What do you think?