The combination of GraphCT and the Cray XMT s massive multithreading permits exploration of graph data sets previously considered too massive. GraphCT is freely available as open source software from our web site and runs both on the Cray XMT and on POSIX platforms.
During the publishing of this paper, we discovered (via a re-send of a Twitter message) independent research also analyzing public Twitter streams [22], [23]. We have applied GraphCT on the Cray XMT to their data set to gather performance data and still are analyzing the graph metric results. Java, et al. [18] in 2007 present an early work analyzing Twitter that applies relatively simple analysis to a smaller data set and hypothesizes more varied use than appears in our research.