Here's an interesting little app to make you think twice about opting in to Twitter geolocation if you happen to tweet regularly. It's called Cree.py and is described as a "Geolocation Information Aggregator".

What does Cree.py do you may ask? Well, it builds a minute-by-minute timeline of a person's movements according to the data they post on Twitter. It can also extract Exif tags from uploaded photos and combine the two to pinpoint a person's exact location. How does that grab ya?

The author says he's not trying to help stalkers, but rather to make people think twice before signing up to Twitter geolocation.

Download link which includes screenshots of the tool here: http://ilektrojohn.github.com/creepy/