Lists are a way to organize your bookmarks. The other way is tags.
They can either be public, which means that anyone can view them or private.
Private List Sharing
You can share private lists to anyone on the internet, by generating a special “share” link.
You can subscribe to lists and be notified each time a bookmark is added.
From the first time you navigate to your lists, you'll notice two lists. “Favorites” and “Weekend Reads”.
You may mark any of your bookmarks as favorite and it'll show up in the “Favorites” list.