Aim. The work has as main objective to present some of the actions of children considered activists to face the climate crisis through social media. Technologies and social mediaallow them a new form of existence and action through their posts, whether is in video,photo or text format, promoting interactions and discussions that captivate hundreds orthousands of followers.Methods. Data collection was carried out from a digital ethnography, analysing thesocial media and linked news in the media of 13 children from different countries (Australia,United States, India, Holland, England, Indonesia, South Africa, Uganda and Sweden) overan 18-month period.Results. To understand the data, digital ethnography was used as a strategy to followthe main interactions and online mobilisations through different social media (Facebook,Instagram and Twitter), as well as linked news in the media about those children, andarticulation of them with governmental, non-governmental organizations and private companies. In relation to the selection of participants, the profi le of a child activist was addedand through the algorithms of these platforms other activists with similar profi les werefound that promote content about climate justice.Conclusions. It was possible to identify that the Internet has enabled the visibility andarticulation of children’s actions on the theme, and how this engagement has promotedawareness and changes to fi ght against the climate crisis. It is worth emphasising theimportance of digital literacy so that access to these spaces is carried out safely and responsibly for this social group.