This article surveys the classic and contemporary literature on the nature and limits of freedom of expression (or free speech). It begins by surveying the main philosophical justifications for free speech, before moving to consider the two most discussed topics in the free speech literature: hate speech and pornography. The article offers some brief reflections on the large number of arguments which have been offered on these topics. Three newer battlegrounds for free speech are examined at the end: no platforming, (...) fake news and online shaming. (shrink)