This work fits in nicely with recent studies of language on-line, digital literacy, language use in social media, and digital discourse. The book presents an excellent case for using the Appraisal Framework to analyze interaction in social media ... I see a lot of potential for future research analyzing hashtags used on and off line, in fact reading this book has led me to conduct some of my own research on hashtags. Zappavigna’s discussion of hashtags as a form of meta-discourse that goes beyond known meanings of metadiscourse, I found particularly inspiring.