This study was carried out to identify the benefits and drawbacks of using mobile social network application WhatsApp in the education of Secondary Education students. In this research, survey model was used and open-ended question form to 145 students together with semi-structured interview technique to 6 students were employed and answer to the same research question was sought by using data of different nature. The data were analysed by content analysis and phenomenologic analysis methods and some of the screenshots of students' posts are given as they are when necessary, which made possible the inspection, comparison and verification of each data one another. The benefits and drawbacks of using WhatsApp for educational purposes, which students normally use for communication purposes, are listed under the subheadings of technique, education and academic. Results indicate that WhatsApp has the potential to provide a natural and unstructured learning environment. Accordingly, by taking the benefits and drawbacks of WhatsApp and the like into account, it is advised to support their educational use.