Lockr decouples content sharing from social networks. You can share content on different sites and manage your social network in a single place. You can grant access to friends based on the type of relation without having them to register on 3rd party sites.
Lockr provides a universally accessible address book for maintaining a single copy of a user's social network which is currently implemented as a Facebook application. Lockr also provides an access control scheme that makes sharing personal content easy.
Currently Lockr only supports Flickr for content sharing and Facebook for management of social relations.
For more information, visit http://www.lockr.org/