Ok so when french people greet eachother, if they already know the person or are being introduced to someone, they kiss on the cheeks. Left cheek first then right. In other regions they may do it 3 or 4 times, but the standard in the south is 2 kisses. Because I grew up in the states, I've really only done that with family and it's like second nature with them. I literally don't even realize when I do it. When coming to France it's a whole new ballpark for me because I'm greeting different people. For example, I'm greeting American people who find the sport quite delightful (me included). I also am beginning to meet people my age and we greet eachother this way too, I even greet little children this way- it's adorable. When signing letters to family you write "Grosses Bisous" (big kisses), I sometimes get the spelling wrong, it'll be gros bise, or gross bissous or grosse bisous. I always get it twisted, but oh how delightful it is, the act of french kissing!