Gist from edit-GeoJSON

map.geojson

{
  "type": "FeatureCollection",
  "features": [
    {
      "type": "Feature",
      "properties": {
        "title": "I'm small",
        "radius":100
        },
      "geometry": {
        "type": "Point",
        "coordinates": [
          -74.35546875,
          40.78054143186031
        ]
      }
    },
    {
      "type": "Feature",
      "properties": {
        "title":"I'm okay",
        "radius":200
        },
      "geometry": {
        "type": "Point",
        "coordinates": [
          -77.6953125,
          38.134556577054134
        ]
      }
    },
    {
      "type": "Feature",
      "properties": {
        "title":"I'll rule y'all",
        "radius":300
        },
      "geometry": {
        "type": "Point",
        "coordinates": [
          -84.814453125,
          40.91351257612758
        ]
      }
    }
  ]
}