Kissing identity card of ITALY

I will start with my country a series of "kissing identity cards", that is summaries about the practice of the cheek kissing in European countries.

Who kisses who (genders):
women kiss women, men kiss women, men may kiss men (relatives or close friends)
Number of kisses: 2 (standard) or 3
Starting from: the left cheek (your right)
Whom to kiss:
- relatives
- friends
- acquaintances (usually not upon first meeting)
DO kiss:
- upon meeting relatives (even every day, depends on people)
- upon meeting or leaving friends you haven't met or won't meet for a long time
- to express congratulations (e.g. marriage) or wishes (e.g. Christmas, birthday)
- to thank someone you know (e.g. for a gift)
- to show affection (to relatives and close friends)
DO NOT kiss:
- upon meeting or leaving someone you see everyday (except relatives)
- upon meeting someone for the first time
- in formal situations