I thought about this, and I think music/chat/travel are more directly tied to culture and inter-personal interaction than ping-pong/xbox/free-cola.

I remember reading that Githubbers are into Techno (trance?), so that speaks to the kind of people you're likely to work with.

Chat is passive communication, which is something many developers look for. (God, if I could get a dime every time a sales/marketing guy went to talk to devs directly despite me getting all over their case so many times...)

Travel I'm going to give the benefit of the doubt and think it's travel for OSS conferences and the like, which again not all companies provide or look favorably upon.