This study investigates how people use politeness strategies in online communication, especially on social media. It focuses on three main goals: identifying the politeness strategies that users apply on selected social media platforms, examining how these strategies help manage face, keep harmony, and build social relationships, and assessing the impact of these strategies on online conversations and communication across cultures. To achieve these goals, the study used a qualitative research method, analyzing online conversations chosen from Facebook, WhatsApp, and Twitter (X) platforms. The analysis was guided by Brown and Levinson’s Politeness Theory and offer a clearer picture of how people handle politeness in digital interactions and provide insights into how social values, norms, and virtues are maintained in the increasingly digital communication landscape. The study concludes that in the Nigerian context, online politeness includes cultural markers like greetings, terms for family members, and religious comments. It goes beyond mere etiquette; it is an essential tool for promoting cooperation, reducing conflict, and upholding social values in digital spaces.