A constellation of Astronomers
The graph below represents the connections between users tweeting about the 219th meeting of the American Astronmical Society. Unfortunately you need quite a large window to see it.
The circles represent Twitter accounts; the color is coded based on the number of followers of each account using the scale given at the top of the graph (it's also included in the mouse-over text for each node), although I don't have this information for all users. The links between the nodes identify those users who have mentioned another user in a tweet, using the @name syntax; the line widths increase based on the number of mentions but given that the graph is ever-so-slightly crowded this isn't that useful at this time. If you move your mouse over a node then you should see a pop-up giving the name of the user and the lines connected to this user are highlighted; you should probably wait for the animation to stop, or use the handy-dandy "Stop" button, before trying this.
Please see the data collection page for a description of how the data was collected and processed.