The focus in this volume is on social media discourse, (dis)identifications and diversities. It demonstrates how particular ways of mobilizing verbal, discursive and other semiotic resources serve as means for identity work (Bucholtz, 2003; Blommaert, 2003), involving acts, processes and practices of (dis)identification as essential aspects of sociality in social media. It will also illustrate how such social action also increasingly engages with a range of diversities in social media.