Reminds me of this graph: http://tofesi.mimuw.edu.pl/~cogito/smarterpoland/facebook/siec.png http://tofesi.mimuw.edu.pl/~cogito/smarterpoland/facebook/si... A

Reminds me of this graph: http://tofesi.mimuw.edu.pl/~cogito/smarterpoland/facebook/siec.png http://tofesi.mimuw.edu.pl/~cogito/smarterpoland/facebook/si... Arrows show flows between groups, times are average time spent between changes in that group.