Publisher's version (útgefin grein)This paper proposes that the digital domains of language use (DDLU) be included in future assessments of language vitality. DDLU, including the consumption of online content, engagement with social media and chat which now make an important, and rapidly growing, part of the daily language use in many speech communities. This is true even in communities which were until recently fairly isolated from modern technology. Criteria for determining digital language vitality vary according to the general situation of the language but constitute a separate dimension-languages otherwise in a similar situation can differ considerably in terms of digital vitality. We consider, for instance, advanced language technolog...