NEW YORK (AdAge.com) -- The technique of "social video" -- the use of video as the central organizing element for social interaction and storytelling online -- is beginning to demonstrate its power. In this second part of our "About Digital" report on the latest trends in viral video, we analyze Samsung's "HD Camera Phone Trick." That YouTube clip was created and produced for Samsung Mobile by London's Viral Factory. Its traffic and engagement patterns were tracked and analyzed by Visible Measures. They may tell us a lot about the future of online advertising.