Greeting standards in Lebanon can be very confusing for unexperienced visitors. For example , if you hug and kiss someone who greets you with a hand on their chest (like someone I know did), you will have a traumatizing experience that will stick with you for life(7 years and counting).
So here are some guidelines to help you with the different situations, but beware even the experienced and savvy mess up with this complex system.
1.No kiss, No Handshake (and preferably no eye contact)
When meeting an ultra-religious Muslim (Hezbollahian, Your Saudi friend's wife, etc...) of the opposite sex.
2.Handshake with No kiss.
When being introduced to someone for first time (same or opposite sex), or when greeting some you know of the opposite sex who is a practicing Muslim.
3. One Kiss (One cheek)
Casual friends of opposite sex that you see often.
4. Two kisses (Both Cheeks)
When you're pulling back from what you think is a One kiss situation and you realize the other person thought it was a 3 kisser, it is immediately understood that a compromise is reached at 2.
5. Three Kisses (Right Cheek, Left Cheek, Right Cheek)
When greeting a friend or a relative that you haven't seen in a while. "A while" ranges between 3-4 days for an opposite sex friend and 3-4 months for a same sex friend.
6. Four Kisses (Right, Left, Right, Left)
When greeting someone you genuinely like, someone you really dislike, or you're a politician during a photo-op.
7. Twenty Seven to Over a hundred Kisses (9-35 kisses in quick succession on right, left, then right cheek again)
Grandmas, Aunts, and random old ladies in the village. They might look weak and fragile but once they get a hold of you there is no escaping until they are done with their barrage.