Throughout 2020 it has been seen that the Covid-19 pandemic has been an unprecedented health crisis that has involved a major change at both level informative and media. Audiovisual content has increased considerably and there is interest on the part of health institutions to demonstrate their ability as a reliable and first-order source of information. In fact, since the declaration of the pandemic, in just 2 months the number of content disseminated throughout 2019 was exceeded. This study seeks to describe the response given to this health crisis by the Spanish National Health System on YouTube. For this purpose, we analyze the 1035 audiovisual content that the official channels published in 2020. To carry out the analysis, the contents have been classified into 7 types, from press conferences to tutorials, recommendations, informative pieces or testimonies; the topic covered in each of them has been identified, the format, as well as the number of views and user feedback.The period of greatest production corresponds to the first wave and the de-scalding wave, and the health institution that has disseminated the most messages has been the Ministry of Health: 603 vídeos, 170 animations and 263 hybrid pieces –combining real vídeo, text and icons– have been identified. Animations and hybrid pieces are the most successful messages, and are primarily used on an appealing nature to disseminate healthy recommendations and habits. This study values the use of animations as an appropriate information resource for education and health promotion. In addition, it has allowed us to identify the main weaknesses, threats, strengths and opportunities presented by audiovisual health information on YouTube.

Abstracts [ES]Introducción. Dada su influencia, las empresas se están viendo obligadas a integrar las redes sociales en sus estrategias de comunicación. Objetivos. Pretendemos ofrecer una visión general sobre el uso de Facebook y Twitter en las principales marcas comerciales en España y analizamos la actividad de las cuentas más sensibles a las críticas para conocer la estrategia comunicativa de sus responsables. Método. Se han seleccionado las cuentas de las tres marcas con mayor inversión publicitaria en 15 sectores, recopilando y procesando 5.433 tweets y 3.000 posts en una tabla analítica. Conclusiones. Queda demostrada la presencia masiva de estas compañías en las redes sociales, al tiempo que se constata la variabilidad extrema del número de seguidores, el tráfico y la naturaleza de la información. Sin embargo, se ha podido demostrar que el uso que se le da a las distintas redes y las estrategias comunicativas requeridas en unas y en otras son distinguibles e identificables. strategies of the companies that tend to receive more complaints from the public. Method. The study is based on the examination of the social network accounts of the three brands with the highest advertising investment in each of the 15 industry sectors. A total of 5,433 tweets and 3,000 posts were analysed. Conclusions. The study confirmed the massive presence of these companies is the social networks and demonstrated the extreme variability of the number of followers, the traffic and the nature of the information published. However, it was also demonstrated that the use made of the different social networks and the communication strategies required by the different companies are distinguishable and identifiable.

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