This diploma thesis deals with the issue of social networks and their marketing tools, which are used in the creation of paid promotion. The theoretical part presents the history and trends in online marketing, analysis of social networks and approaches to online marketing, including methods of A/B testing, guerrilla marketing, CTA and qualitative and quantitative research, which are then used in the practical part. The aim of the diploma thesis was to create a detailed procedure in the field of e-commerce in promotion through marketing tools on social networks Facebook, Instagram and Pinterest and its verification in practice on a specific online store, created by the author for the purposes of this thesis. Another goal was to analyze the ...