If two people about to greet one another are rather familiar, it is customary in France (as well as in other countries) to kiss cheeks — what's called faire la bise. But cheeks don't have lips, you might say. That's true. But at the same time, lips do not have cheeks.
In Japan, people will greet each other with a bow. Bows differ in duration and in angle of decline according to formalities. Men typically bow with their hands at their sides, whereas women will bow with their hands touching on their thighs.
The Maori people of New Zealand will greet visitors with a beautiful gesture called hongi (pressing foreheads and noses together, with eyes closed). Maori will perform this move to initiate newcomers, and exchange the breath of life with them.
In Tibet it is conventional to, upon greeting someone, stick your tongue out just a bit. This practice comes from the belief in reincarnation: a cruel 9th century Tibetan king had a trademark black tongue. When you stick your tongue out to others, it signals that you're not a reincarnation of the king.
One traditional greeting in Botswana has three steps: (1) Extend your right arm, place your left hand on your right elbow, and press hands together; (2) Interlock your hand with the other person's, interlacing thumbs; and (3) Return to the original position and say "Lae kae?" meaning "How are you?" in Setswana.
The Masai warrior tribe in Kenya performs an elaborate ceremony to welcome visitors, not least amazing of which is the adamu or jumping dance. It involves the warriors forming a circle and competing to see who can jump the highest.
In Saudi Arabia, as in other Middle Eastern countries and around the world, Muslims will very often greet each other with a handshake and the words "As-salamu alaykum" will be spoken. Men may follow this with kissing cheeks, and placing the left hand on the other's right shoulder.
In America, a common greeting practice for newly acquainted individuals to merge hands in what is colloquially known as a "handshake." Crucial to the success of this salutation is if the hands of each party are matched: right for right, or left for left. Once clasped, the hands — now as one — can oscillate up and down for as long as feels appropriate.