Throughout history, public relations have played a major role in developing public opinion, and the emergence of the internet and digital platforms has ensured real-time digital communication. Social networks have contributed to the development of public relations, and with their rise, agencies and brands have realized that they can create communities of their followers and that they need to adapt communication to their target groups. As they have developed, the platforms of the new age have shown that their influence on public opinion is crucial and that spending time on them has become part of the everyday life. Business communication gained an increasingly important role with the development of the platforms as employees were able to share their opinions online, and LinkedIn also revolutionized the search for jobs or new colleagues. Communication on that platform is based on business communication and networking, and many executives have established themselves on that network with their views as opinion makers. In addition to job search, many use the social network to connect and network with professionals within their profession. LinkedIn has become an important part of business of many companies because their communication through this channel builds awareness of the company and its image, and because of the functionality of this platform, they recruit employees via LinkedIn too. The paper will demonstrate how the largest public relations agencies (by revenue) communicate on LinkedIn and what topics they focus on.