Modeling real life actions for FB's Open Graph
blog.geekli.st
blog.geekli.st
Useful for those who have strong overlap between people who would care about their commits and friends on Facebook that would give a shit.
On the other hand, it can make following what your friends are doing without having to sift through Github's feed... which is a mess if you ever try to find anything and watch a few projects that have lots of activity.
I assume my non-developer friends don't understand it, so they just ignore it.