Scald
Scald is a social media platform currently under development by Chicago Technology Cooperative. The goal of Scald is to provide a standardized mechanism for manipulating various types of media. Users can specify licensing on their uploaded media, re-use it for themselves, offer it to others for re-use and track all of those interactions without interfering with any other Drupal functionality.
Vocalo.org is a production site running on an early version of Scald.