This special issue of the JLCL gathers five contributions of scholars and projects who aim to close the “CMC gap” in the corpora landscape for several European languages: the French CoMeRe project (Chanier et al.), the South Tyrolian DiDi project (Glaznieks & Stemle), the German Wikipedia corpus (Margaretha & Lüngen), the Dutch VU Chat corpus (Spooren & van Charldorp), and the research on language variation in Dutch Twitter data (van Halteren & Oostdijk).