"Clay brings the conversation about social media and its affect on our communications and group forming abilities through a series of easy to grasp examples. He looks at Sharing. Del.icio.us reverses the old order of sharing - we used to get together in groups and then share. Whereas tagging now allows us to share and then form groups. Look at Flickr where you can post your tagged images on an event then go find others who have also posted on it. The example is HDR photography on Flickr which originated from someone putting the first HDR image up and another person asked how to achieve it. Soon, around HDR the interest group formed. A community of practice. Then Conversation."
(Steven Clark)
[a useful discussion - if somewhat techno-utopian and teleological]