Desktop application Creepy can be described exactly how it's named. Touting itself as a "geolocation information aggregator," the open-source software lets you track users using public information gathered from their Twitter and Flickr accounts. As long as the user had location detection switched on while using these apps, Creepy can trace the data and compile it on map providers like Google Maps, Virtual Maps and Open Street Maps.
We often post location data without a second thought, thinking that a status update or two made public won't get us into trouble. But string it all together in a historic, visual format, and things can indeed turn creepy very quickly.