Free to All: The Wild and Wonderful World of Words

Freedom of speech, to speak as we will without fear of consequences or repercussions, the strange thing I suppose is that this is considered revolutionary, it seems to be a natural thing, but when you really look at it how free is free when it comes to words? Obviously there has to be some sort of limits, like how should you greet your friend Jack that you meet unexpectedly on a plane? Do you say...