The next big Twitter feature? Finding out what your neighbor's talking about, 140 characters at a time, of course. According to All Things D, the service is working on exactly that, a location-based feature that was reportedly developed at a hack week held by the company earlier this month. Twitter, predictably, isn't commenting on the reportedly upcoming feature, but D has says that this information is coming from "multiple sources." No word on how close they all are to one another.