Interesting stuff. Does anyone have a clue where they have got their initial seed data from? It seems very low quality and I'm seeing no sign of place information that they may have got from mine and other sites via the Graph API/Like Button
The article quotes a security expert who doesn't like the way the system is currently set up....
"By default, users are opted in to the ability to be tagged by their friends, they are opted in to allowing their friends' Facebook apps to access their location information, and they are opted in to allowing 'non-friends' checked-in to the same place to see their whereabouts.
"This is all backwards - this should be deployed on a purely opt-in basis and no information about my whereabouts should be posted without my explicit consent, every single time a post is made."