Overview
Lockr lets people share their content with their friends without having to register or maintain copies of their social networks on third-party sites. Lockr provides a universally accessible address book for maintaining a single copy of a user's social network. Lockr also provides an access control scheme that makes sharing personal content easy. [+]
Sharing personal content online is surprisingly hard despite the recent emergence of a huge number of content sharing systems and sites. These systems suffer from several drawbacks: they each have a different way of providing access control which cannot be used in other systems; moving to a new system is a lengthy process and requires registration and invitation of all the friends to the new system; and the rules for access control are complicated and become more so as our networks of online friends grow.
Lockr makes sharing personal content easy. Lockr provides a universally accessible address book for maintaining a single copy of a user's social network, as well as an access control scheme that makes sharing personal data easy. Lockr separates social networks from content delivery.
Currently, Lockr allows people to control how they share their data over BitTorrent and Flickr only. We are planning to support more content sharing systems soon. Please, drop us a if you would like to help.
With Lockr, you maintain one copy of your social network on Facebook (LockrCenter) and share content on any 3rd party website. For now, Lockr is supported by BitTorrent (Lockr for Vuze) and by Flickr (Lockr for Flickr).
Privacy
Warning: Lockr records anonymized usage information into a log. [+]
As part of our research, we will be analyzing these logs to evaluate Lockr. No personal information is recorded in the logs.
License
This sofware is licensed under the CC-GNU GPL.

Copyright© 2008 Amin Tootoonchian, Kiran K. Gollu, Mike Liu, and the University of Toronto.
Lockr comes with ABSOLUTELY NO WARRANTY.