> When you visit a Facebook-enhanced application or website, it may access any information you have made visible to Everyone as well as your publicly available information. This includes your Name, Profile Picture, Gender, Current City, Networks, Friend List, and Pages. The application will request your permission to access any additional information it needs.
http://www.facebook.com/settings/?tab=privacy§ion=applications&field=learn
Meaning that the data you get as an app is the same as the data
available to any member of Facebook browsing to your page after
login. Pretty reasonable, IMO.
-Ben