The first part of the undergraduate thesis "Correlation of the content of domestic influencers on Instagram and TikTok" covered theory and also dealt with the following: defining key terms related to social networks and influencer marketing, descri bing social networks as an indispensable communication and marketing tool, present ing and explain ing the types of content on social networks and describ ing the influence of social networks on the entire society and the individual. The example given in the thesis was the Coca-Cola brand campaign. The campaign was ran in cooperation with local influencers, with the aim of reaching a larger number of potential new consumers. The practical research part of the thesis analyzed the results obtained from in depth interviews with five domest ic influencers and compared the connection of content made on Instagram and TikTok. MMoreover, the aim of the thesis was to find out: if influencers use special strategies when publishing content, if they adapt the content to the social networks on which they are published, if they follow trends on social networks and was there an ideal formula which would make content become viral The final part of the thesis focused on a critical review of the influence of influencers in today's marketing communication, a s well as the conclusion and recommendations for practice.