The efficient use of social media is essential in today’s world, as it leads to faster and quicker communication which provides feedback to and from the public. The study explored the use of Instagram, to build good relations, and brand, enhancing PR practices and revealing how Instagram is being used by the public relations practitioners in government institutions of TANESCO, TCRA, and TRA in Dar es Salaam in facilitating communication engagement with the public. The study analyzed the type of information disseminated to the target audience, understood how public relations practitioners handle followers’ feedback, comments, and responses, and determined the impact of using Instagram by TANESCO, TCRA, and TRA PR practitioners. The key findings showed that all three organizations use Instagram to disseminate educational, informational, awareness, and promotional content. They all focus on updates relevant to their services and have dedicated teams for managing social media pages. They respond publicly and privately, ensuring that queries are addressed promptly, and they all said that Instagram has a positive impact on communication engagement, as they can reach large audiences quickly and receive immediate feedback. Based on a qualitative approach, and an exploratory case study research design, data was collected through observation and in-depth interviews, Data collection tools of observation and interview guide were used and data was presented thematically. The study is a very crucial tool for PR practitioners in facilitating communication engagement with the public, and the emergence of SM like IG has changed the way how their organizations communicate. The study recommends the Communication Units of government institutions make more efforts to use Instagram as it minimizes the cost of running press conferences and reaches a large audience that will help them get feedback from the public more easily and faster.