To all social media users having most of their bookmarks online Trunk.ly may be most valuable. The service automaticly collects the links shared on social networks and makes these links available. It even indexes the underlying content and builds a searchable database of the underlying content. Furthermore the service is a social network presenting its members on profile pages with facilities to follow others, to communicate and to go on sharing the already collected links, to developers an api interface is available.
A specialty is the reason the service has been launched. At the about page it is mentioned, that the rumours about the possible closure of Delicious gave motivation. So if there will be a need to save bookmarks, the service for you may be Trunk.ly.