The network movie lasts about 3 1/2 minutes and is interesting. You can find a more detailed description of how the twitter data were collected at the following website ("The Egyptian Revolution on Twitter"). I believe that the node on the right with a lot tweets points at and away from it is a guy from NPR.
Another example comes from the Freakanomics blog/podcast ("Is Twitter a Two-Way Street"). Stephen Dubner interviews Duncan Watts, the former Columbia sociologist (he actually was trained as a computer scientist) who now works at Yahoo! Research. Watts is the author of the book, Six Degrees, (no, Kevin Bacon isn't the one who came up with the term -- it goes back to the social psychologist, Stanely Milgram), which is a very readable (and entertaining -- he's a good storyteller) book on network science. He's also the author of Everything is Obvious (Once You Know the Answer) and the co-author of a recent paper called “Who Says What to Whom on Twitter.”
Dubner also interviews Justin Halpern, who turned his Twitter feed “Sh*t My Dad Says” into a best-selling book of the same name and a TV show. Halpern has millions of followers but follows only one other person.