From January 20th 2010, Facebook has upgraded their photo album feature to support 720 pixels high (or wide). So if you have fast Internet connection, then why not resize the photos to 720 pixels and share those with your friends ?
Pour tous ceux qui se demandent quelle est la résolution optimale pour facebook! C'était 604, et maintenant c'est 720px!
/ For everyone wondering what is the optimal resolution for a sharp picture on facebook; as of january 2010 it's 720px.