Their concept HubBuds is a mashup of the Github and Yammer APIs. It pushes git commits to Yammer and pulls Yammer commentary back in, which allows technical and non-technical team members to stay up-to-date on shared projects. It also translates project activity and likes/dislikes into badges and awards, which helps to maintain team spirit and velocity. In so doing, HubBuds takes Github’s concept of “social coding” a level up.
Source code is available here.