gistfile1.txt

            var postVolumes = d3.map(instasound.neighborhoodStats).values().map(function(d) {return d.posts});
            var postVolumeScale = d3.scale.linear()
                .domain([d3.min(postVolumes), d3.max(postVolumes)])
                .range(["black", "red"]);
            console.log(postVolumes);
            console.log(postVolumes.map(postVolumeScale));