The purpose of this research is to reveal the importance and the place of Facebook, one of the social media channels, in the advertising industry. Therefore, it is to detect the effects of the Facebook ads on Facebook users' pre and post purchase behaviors, and to offer suggestions for increasing the sales of the brands as a result of these determinations. The study was conducted on 271 people living in Konya. When these persons were identified, the randomness taking into account. Both quantitative and qualitative research methods were used in the research and questionnaire application was used as the general screening method. Datas in the research; obtained with questions about the behavior of Facebook users before and after purchasing with demographic characteristics of the users. As a result of the research, each question about the pre- and post-purchase behaviors of a product affected by the ads seen by Facebook users were obtained. According to these results, suggestions have been made to increase sales of brands.

Keywords: Advertising, Social Media, Facebook.