Google, Facebook, MySpace and More Meet to Talk Activity Streams - ReadWriteWeb
http://www.readwriteweb.com/archives/google_facebook_myspace_activitystreams.php

how to handle media files in activity feed streams

People from Google, MySpace, Facebook, Yahoo!, Nokia, Comcast" and startups met on January 8, 2009, to "discuss proposed standards for the future of 'activity streams'." Marshall Kirkpatrick analogizes standards to the railroads' standardization on gauge track.