More importantly, I don't want have to abide by some API to interact with another developer. Hell, if I want to play toss with a nerf football with one of the other developers, I should be able to do that (of course, if the want is mutual). Which technology will allow me to do that?
I worked at a startup last summer. The developers and I would hangout outside of the "war" room, playing call of duty, grabbing some beers, or whatever sparked our interest. The times outside the workplace are often the most memorable in a job.