Great event by The Wall Street Journal on social media. Especially good was Harry Gold's presentation from Ovrdrv (the first presentation I captured in the video below). Ovrdrv won "2009 Best Use of Social Media" for their Harley Davidson Mosaic. Try typing in "John1" on the mosaic page to see what happens, under "find photos with a code". That is a "one" next to John, not an "L").
Here is video from the event: