Here is a very useful link. Yes my friends, kissing in France is a serious business, and VERY complicated that someone has produced a map.
Notice how in the North, there is a 'blip' in the region where you have to give 4 kisses to greet someone.....this might well explain the time I headbutted one of Julien's relatives when meeting him for the first time....I was terrified and totally shocked when he wanted to go in for 2 more kisses, getting to a total of 4. I saw this guy again recently and was much more physically and emotionally prepared to being facially assaulted.
The next time you meet a Frenchie, ask them if they have a copy of this map in their wallet...I think I will be adding it shortly.