Following an announcement on Sept 30 2009, Nexus friend grapher shut down permanently on Oct 7 2009. We had many users, and we thank them for talking about Nexus.
Nexus launched in October 2007; a few early testers knew it as Friend Atlas before a friend came up with the better name. Nexus generated over 500,000 friend graphs for 84,000 users. We shut down Nexus because it was devouring disk space, memory, bandwidth, and sysadmin/maintainence time. It was also a niche tool and we didn't really know where to go with it.
(Thanks to Max Kiesler for recording it.)
Nexus source code: Nexus-2009-10-14.tar.bz2 (see MUST-README.txt, DEPLOYMENT.txt files)
Last updated December 18, 2011.