In its contemporary form, the processes of activism became transnational, since its actions, causes and organization is done beyond the limit of national borders, establishing a dynamical relationship with the logics of digital communications. Using the internet, activists would have more possibilities of establishing networks of collaboration, publicize its causes and actions, promote specific points of view and generate more engagement in the public debate and more people to participate in activism. Therefore, the purpose of this work is to promote a brief review of how the academic literature is analyzing specific cases of transnational activism and its sociopolitical context to generate a better understanding of which and how the potentials of horizontalization from the internet are manifested. Two research questions are addressed: how are the actors of climate change activism analyzed in the social media data analysis of the literature, and how are the social networks of activists being explored. The conclusion is that it is possible to find evidences of activists breaking the agendasetting of traditional media, as well as promoting new framing of the discourse surrounding its actions and causes, new networks of collaboration and transnational and collaborative forms of organizing and creating actions through social media. However, big data analysis of activism processes in social media is still beginning and new research with more depth in the information analysis would benefit immensely in the comprehension of its dynamics