He created the below visualization the “VIZoSPHERE” on Gephi.
He pulled data from 1645 twitter accounts that are “related to the topic of information visualization”. Accounts in the graphic are linked by relationships on Twitter ie. Friends and Followers.
Here is an exceprt from well formed data:
The accounts were determined as follows: For a subjective selection of “seed accounts”, the twitter API was queried for followers and friends. In order to be included into the map, a user account needed to have at least 5 links (i.e. follow or being followed) to one of these accounts. The size of the network nodes indicates the number of followers within this network.
Image Source: Well Formed Data