Eugene Lee's keynote address at Enterprise 2.0 Boston June 2010 introducing the concept of the Social Layer. Social is all about breaking down and crossing silos, not socially enabling existing ones.
17. Connector: connects an application silo to the social layer
Annotator: applies social and business logic to connector data,
annotates and promotes messages
AppBots: enable human interaction with enterprise data and
processes
Application Streams: enable interaction with applications in the
context of an activity stream