Possibly the most useful post (ever?), showing how using Twitter can delineate communities of interest and lead from ephemeral and transitory utterances to more stable representations of (still dynamic) useful knowledge http://bit.ly/a9aETqIt does, of course depend on people using conventions (Twitter hashtags) consistently. The rebels at ALT-C who resented the waste of three characters and insisted on tagging #alt10 instead of #altc2010 won’t be picked up in these algorithms. No matter how otherwise influential, their influence in these searches would only be felt through their reflection in the interests of those they connect to.
I think there may be some limitations on the depth of search for new hashtags, or the pipe needs to be rewired. I would have expected the tag #falt10 to have appeared several times.