Online Communication in a Second Language examines the use of social computer mediated communication (CMC) with speakers of Japanese via longitudinal case studies of up to four years. Through the analysis of over 2000 blogs, emails, videos, messages, games, and websites, in addition to interviews with learners and their online contacts, the book explores language use and acquisition via contextual resources, repair, and peer feedback. The book provides insight into relationships online, and the influence of perceived 'ownership' of online spaces by specific cultural or linguistic groups. It not only increases our understanding of online interaction in a second language, but CMC in general. Based on empirical evidence, the study challenges traditional categorisations of CMC mediums, and provides important insights relating to turn-taking, code-switching, and language management online.