//for each row in sheet it creates a pin/circle on a map
for (i = 0; i < range.values.length; i++) {
  var row = range.values[i];
  var lat = parseFloat(row[0]);
  var lng = parseFloat(row[1]);
  txt.push(row[2]);
  var MapPinCircle = new google.maps.Circle({
    strokeColor: "#F36E210",
    strokeOpacity: 0,
    strokeWeight: 2,
    fillColor: "#F36E21",
    fillOpacity: 0.75,
    map: map,
    center: {
      lat: lat,
      lng: lng
    },
    radius: 5 * 5,
  });

  //Display popup on click (need to pass "i" varrible for what pin is clicked)
  google.maps.event.addListener(MapPinCircle, 'click', function() {
      alert('Tweet: ' + txt[i]);
  });
  console.log('lat: ' + row[0]);
  console.log('lng: ' + row[1]);
  console.log('txt: ' + row[2]);
}