The current research was conducted to evaluate the views of mentor and pre-service teachers participating school-based practicum about the effectiveness of Web 2.0 based supervision. The implementation process with a pilot study in the research lasted two years. In the pilot study, the evaluation of school-based practicum was made within the meetings among the lecturer and preservice teacher at the faculty. It was found that there should be an environment independent of time and place to give feedback to preservice teachers during the practicum. In this context, four of the groups of preservice teachers were randomly selected. A responsible lecturer and mentor teacher were assigned to each group. Google Classroom environment was created to offer pre-service teachers an opportunity to receive feedback from different stakeholders such as a lecturer-mentor-preservice teacher. During the school based practicum, preservice teachers recorded their teaching practice in class and shared their teaching videos in online environment. The data obtained from tools such as video recording of classroom practice, online discussion and interviews were evaluated in the qualitative analysis program. As a result, it was determined that school based practicum in the online environment has its weaknesses and strengths. It was discovered that preservice teachers and teachers have differing views as well as overlapping views. In light of all these views, suggestions regarding school based practicum were made for a model for Web 2.0 based supervision.