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human brain networks represent a balance between high efficiency of information transfer and low connection cost

Members of the audience and other Twitter users were asked to tweet during the lecture about the concepts that were being discussed, using the hashtag #csftwitterbrain. At the end of the talk Professor Bullmore displayed the resulting image showing the interconnectivity of the hashtagged tweets, and explained how Twitter networks can be compared to the human brain network. “We found that the #twitterbrain network was somewhat like the brain network in being small-world and modular with highly connected hub nodes; however the brain network was more clustered and less efficient than the twitter network. So at first sight there were some points in common and some points of difference between these two information processing networks.”

“It has been intriguing to see the spectacle of watching the twitter network grow or evolve over the course of several days. And I have learnt a lot about the power of new media to engage and communicate, and the potential scientific value of using Twitter to map and measure social networks.”

In my own classes I've been deliberately vague about what students should tweet about. I didn’t want overly prescriptive guidelines to constrain what might be possible. Instead, I wanted our integration of Twitter to evolve organically. Given this open-ended invitation, I’ve found students tend to use Twitter for class in three ways: to post news and share resources relevant to the class; to ask questions and respond with clarifications about the readings; and to write sarcastic, irreverent comments about the readings or my teaching. The first two behaviors add to the community spirit of the class and help to sustain student interest across the days and weeks of the semester. The third behavior, when I first noticed it, was an utterly unexpected finding. (And as I've argued elsewhere, it was a good, powerful surprise that legitimated my use of Twitter in and outside of the classroom. I saw students take an oppositional stance in their writing—a welcome reprieve from the majority of student writing, which avoids taking any stance at all.)

I strongly recommend creating a permanent Twitter archive. A free service such as TwapperKeeper will track a specified hashtag, collecting the tweets 24/7, and you simply return to TwapperKeeper any time to download the archive. It's so easy to use that I've begun creating TwapperKeeper archives for any hashtag there's even the slightest chance I'll be interested in revisiting later. Another useful archiving tool is called, appropriately enough, The Archivist.