When reading the background on Graph from October (http://blog.getprismatic.com/blog/2012/10/1/prismatics-graph...), I came across this: Of course, this idea is not new; for example, it is the basis of graph computation frameworks like Pregel, Dryad, and Storm, and existing libraries for system composition such as react.

I wanted to point out that the programming model behind Dryad and Storm represent computations as graphs, but that the programming model behind Pregel is for computations on graphs. It's a subtle difference in words, but an enormous difference in what you actually do.