When we used 1000000 instead of 1E6 the coordinates were rounded off and therefore up to one degree (110 km) off from the true location.
int lon = (int) item.getStatus().getGeo().mLongitude * 1000000;
// rounded off coordinate lat :42000000 lon :-87000000
int lat = (int) (item.getStatus().getGeo().mLatitude * 1E6);
// correct lat :42239902 lon :-87971504
Log.e("Map", "lat :" + lat + " lon :" + lon);
mPoints.put(item.getProfileImageUrl(), new GeoPoint(lat, lon));