Flickr introduced a novel privacy feature yesterday called “geofences”, which lets you hide the location data of photos taken in certain locations from the general public. It seems like a great idea, but blogger Thomas Hawk points out that there’s a pretty big loophole in the system:
Although the geotag information is indeed pulled from the flickr photo page, ANYONE can potentially still get your geolocational data simply by downloading the original sized file and looking into the EXIF data.
This means the geofence feature doesn’t actually wipe the geotag information from the photos you upload, but simply prevents the data from being displayed in an easy-to-view format on the Flickr site. If you make the original versions of your photos available for download, the general public can still access the location data found in those. To close the loophole, simply make it so people can’t download your originals.