This article explores third space social media spaces for Indigenous language learning, use and activism in secondary schools in Indonesia and Nicaragua. Both studies specifically highlight Miskitu, Mayangna and Lampung youth participation in social media technologies such as Facebook, YouTube, Instagram and Line as a means to reclaim their languages and cultures, as well as their Indigeneity and voices, in the 21st century. In Indonesia and Nicaragua, youth balance intercultural competencies, multilingualism and multimodality layering local, national and international languages as a means to broker between glocal discourse in disparate youth communities. Local and global Indigenous language activists partner with Miskitu, Mayangna and Lampung youth to support their efforts to merge their digital competencies from outside of the classroom into the arena of academic digital activism for both learning Indigenous languages and creating alternative media spaces online.