Social media platforms have become a part of our daily lives and have significantly transformed the way we communicate, connect, consume, and share information. Apart from personal use, social media platforms have also become essential for businesses and organizations. Connecting with customers and audiences, promoting products, and engaging in two-way communication have opened new opportunities. The popularity of social media has risen with the increasing use of mobile devices. Platforms like Facebook, Instagram, Twitter, LinkedIn, and YouTube have millions of active users. Accessibility, speed, and interactivity are just some of the advantages that social media offers for personal use as well as for companies and organizations. Two-way communication on social media is one of the reasons why the nonprofit sector is embracing the use of these tools. Nonprofit organizations play a significant role in the development of society and have a wide audience. Due to the nature of their work, they rely on public opinion, and the interactivity of social media enables direct communication with the public. Moreover, gaining public support eases the process of creating a positive image and positioning the organization. Nonprofit organizations have a broad and diverse public. Public relations in the nonprofit sector can be complex. As their goals may vary, the primary objective of every organization is to gain support for its mission. The Boranka campaign used a unique communication strategy to attract volunteers and partners. The integration of online and offline communication, leveraging social media, and the distinctive creative element of the Boralica campaign made Boranka the most awarded nonprofit campaign in Croatia. This master's thesis involves an analysis of social media of the Boranka campaign, along with an interview with the campaign's main coordinator, Dan Špicer and with the creative director of the campaign Igor Mladinović. The results demonstrate the success of the campaign and provide insight into its communication strategy.