People will share what they find or have collected, and like a trophy case in the home, they will display those collections for others see, envy, and borrow. Eventually they have conversations around them.
A user wants to save an item for later viewing, sharing, or discussion.
A user wants to mark an item (person, place or thing) as a preferred object.
When people freely tag content and share their tags others may find things more easily.
A person wants to subscribe to the content of another person and read it in an environment of their own choosing.
The user has created a collection and wants to display it to other people.