This study investigates the level of parental Facebook mediation in 15-19-year-old teenagers' Facebook use in southeast Nigeria. It embodies four research objectives and four research questions, and its theoretical framework is social learning theory. It adopted questionnaires and informant interviews as primary instruments for data collection and journal articles and books as secondary data sources. The quantitative survey sample size was 400, obtained through the Taro Yamane formula. Also, the sample size of the qualitative survey is 40, calculated based on Hagaman and Wutich's data saturation method. The study presented and analysed its data using a 5-Likert scale, simple percentages, and weighted mean scores. The finding showed a low level of parental mediation, as the parents never helped the teens to know how to set Facebook's privacy, set rules about the time for their Facebook use, or inspire a discussion about their Facebook-related issues. The findings also indicated that parents rarely explained the importance of online safety to teens. Hence, the study, among other measures, recommends media literacy for parents and teens.