Some body language has many different uses. Perhaps the best example is smiling. A smile can   help us get through difficult situations and find friends in a world of strangers.    1     We can use a smile to apologize, to greet someone, to ask for help, or to start a conversation . Experts suggest smiling at yourself in the mirror to make yourself feel happier and stronger. And if we are felling down or lonely,     2     seeing the smiling face of a good friend.