Outlining the challenges involved in the study of social media discourse that includes social interaction, relationality, intersubjectivity and intermodality, this book takes a social semiotic approach to offer a useful reconceptualisation of existing tools and introduces new methodologies to help those studying in this area. Drawing on a range of corpora that feature tweets, Instagram photos, YouTube comments and emoji, this book is essential reading for students studying modules on discourse analysis and language and media.