The document analyzes how horizontal communication networks, particularly via social media like Twitter and Facebook, are transforming journalistic practices and the formation of public agendas regarding climate change. It highlights the shift in news dissemination, emphasizing that information is now influenced more by personal networks than traditional media outlets, leading to a more interactive and chaotic agenda-setting landscape. The study calls for the development of new structures for integrating professional news within social networks to enhance civic engagement and knowledge building.