This paper explores how social networks influence marketing and the development of small entrepreneurships. The literature emphasizes that social media are a powerful tool for small and medium-sized enterprise owners and managers to build their networks. In the Republic of Croatia small entrepreneurships are the most promising part of the economy so that small and medium-sized entrepreneurs are potential sources of creative energy that can contribute to the dynamics of the Croatian economy. This graduate paper aims to describe how small entrepreneurs use social networks and to show the extent to which they can be effective for marketing strategies. A huge advantage of social networks is that small entrepreneurs can use them in the same way as large corporations at no great cost. By comparison of the years 2017 and 2018 it is obvious that the use of social media has increased by thirty eight percent in relation to 2017, while by the year 2020 an increase by fifty percent is expected. The research showed that entrepreneurs have to follow the trends constantly and be one step ahead the competition if they want to maintain and to expand their business. From the interview that was lead with a small entrepreneur I came to the conclusion that marketing on social media has become and absolute imperative. Based on the theories and rules it is clear, that small entrepreneurships through social networks, with a right approach and clear targets, can easily reach their aimed customers and that social media help building long term relationships with business partners and clients.