This book outlines a coherent genre history of the personal weblog from the perspective of media linguistics. An analysis of a diachronic corpus (1997–2012) suggests distinct phases in the history of the genre. In addition to media linguistics, the author draws on methods from textual and corpus linguistics as well as the social sciences. He traces the personal weblog’s various relations to different on- and offline genres and describes the blog communication form as well as the communicative situation, structural features and several posting genres characteristic of personal weblogs. The findings are embedded into theoretical considerations on genre change in general as well as stability and change of web-based genres in particular.