i’m not sure how i missed it till now, but until two days ago i’d never heard of Flickr (the photo management tool and community). now i’ve seen at least a dozen references in the past 24 hours. the most recent is Mappr, a wonderfully elegant hack from Mike Migurski and Eric Rodenbeck of Stamen Design who have used the information people tag their photos with to make a real-time map of recent photos posted to Flickr.
makes me think about the possibility of a real-time “community of readers” which allows you to see everyone in the world who is reading the same electronic document you are (assuming they have “opted-in” and allowed their names to be public).