This study explores the reasons of unfriending/unfollowing decision Facebook users by applying qualitative and quantitative research methods. For the purposes of the study, an online survey is conducted and snowball sampling was used to reach out active Facebook users. 462 valid survey forms were collected and data is analyzed by using descriptive analysis and inferential analysis. The study indicated that insulting behavior, flirting attempt, content against animal rights, racist and sexist attitude are the main online reasons of friendship dissolution for Facebook users. For the offline reasons, betrayal has the highest agreement level (%86,6) for unfriending decision. Additionally, significant difference is investigated among the demographic groups by conducting ANOVA and t-test. Results revealed that there are significant differences between different gender, education and age groups. This research was conducted in Turkey and finally, findings were compared with the previous researches that were conducted in the USA and Germany.