This chapter explores how human–AI communication is becoming deeply embedded in the personal, social, and cultural dimensions of human life. It begins by examining the role of mental models in cross-intelligence communication and how aligning divergent representations of reality is key to mutual understanding. It then analyses the rise of personalised AI communication, the importance of neurodiversity-aware design, and the nuanced impact of anthropomorphisation. The discussion extends to the cultivation of trust and rapport with AI systems, the emergence of shared communication protocols, and the complexity of cross-cultural AI communication. The chapter concludes by positioning AI not just as a passive recipient of cultural norms but as an active participant in shaping new forms of social and cultural meaning. Together, these perspectives illuminate how AI systems must evolve to respect and reflect human plurality while also co-authoring the next phase of our communicative evolution.