Paul Lazarsfeld’s two-step flow of communication theory tells us that the mass media does not directly influence the mass audience. The information from the media is shared to the audience with the help of opinion leaders. Opinion leaders are those who consume more media content than other members of the community. They are influential when it comes to topics in which they are perceived as the most interested and the most knowledgeable members of the community. Today, social media has a special group of users - the influencers. Influencers have large followings, and their influence is recognized by the marketing industry. Through this thesis we tried to find out whether influencers are opinion leaders, as Lazarsfeld described them. The method used in the research part of the thesis is the survey. By examining the existing academic sources and the analysis of the results of the empirical research the inital hypothesis has been declined. Social media influencers are not the same as opinion leaders, as described by Paul Lazarsfeld. Although influencers and opinion leaders share some of their characteristics, influencers are lacking in the „opinion leadership“ feature. Research results have shown that, compared to other information sources, influencers are not a relevant information source in the decision making process. The most reliable information sources, based on our results, are “proven experts and professionals in the field” and “best friend”. Our conclusion is that, to be a reliable information source, you need to have at least one of the following qualities - emotional closeness and knowledge.