distinct from motor speech impairments or primary language impairments (e.g. aphasia), in that the impairments arise from the diffuse axonal injuries which occur in frontal and prefrontal areas of the brain [6]. These impairments can be defined as any aspect of communication that result from underlying deficits in cognition [4,5,7].Communication difficulties after a TBI can affect how a person hears, listens, understands, speaks, reads, writes, and how they engage in conversation and social communication [5]. The underlying deficits of cognition that affect these communicative functions can include slowed information processing; impaired working memory and attention; disorientation and disorganisation; executive function problems including rigidity, poor conceptualization, planning, and problem solving; and poor self-control or selfregulation of cognition or behaviour [4,5]. As a result of these changes in cognitivecommunicative processes, people with TBI have been described as 'overtalkative, inefficient, tangential or drifting from topic to topic, or lacking in language output. ' [4] (p.354). These cognitive-communication impairments can restrict a person's ability to communicate, live independently, return to work or education, participate in society, and build or maintain relationships after their TBI [8].The International Cognitive (INCOG) guidelines for the management of a person's cognitive rehabilitation following TBI highlight that assessment of cognitive-communication skills should incorporate performance in everyday social activities [4]. Adolescents and young adults, the group most at risk of TBI, use digital and online communication MANUSCRIPT ACCEPTED -BRAIN INJURY: 02 FEBRUARY 2017 4 technologies from a young age [9] and, following TBI, involvement in social, academic, and societal situations may be reduced with difficulties using technology and social media [5]. As a result, people with cognitive-communication impairments resulting from a TBI face challenges in accessing information independently and engaging effectively in social networks [8]. However, little is known about how people with cognitive-communication impairments after TBI use and experience digital communication and the internet.Furthermore, clinical guidelines for the assessment of cognitive-communication skills following a TBI do not provide guidance on the use of social media, or of assistive technologies (AT) to support cognitive-communication rehabilitation [4,5].In order to review the existing literature on technology it is essential to consider which types of technology appear in relation to TBI and cognitive-communication. In this study, we considered three major categories of technology: (i) Assistive Technology (AT), being 'any item, piece of equipment, or product, whether it is acquired commercially, includes technology such as email, the internet, and mobile phones [13] which enable users to access, store, transmit, and manipulate information [14]. The multiple purposes of the different types of technology selected ...