In the U.S. it has become more common to use f...

In the U.S. it has become more common to use fist bumps instead of an ordinary handshake.If you don't knowa fist bump is clenching the hand into a fist and touching the knuckles together with someone.I am not sure ifhas ever been done in more formal situations but I really think a handshake is more appropriate esp. In formal situations. What do you think? Has the fist bump become common in your country?