The research aims to determine Web 2.0 tools usage levels of teachers teaching at preschool, primary and secondary school levels, in terms of school levels and educational backgrounds, and to reveal the possible relationship between teachers' use of Web 2.0 tools and their self-efficacy levels. The study comprised 203 instructors from Zonguldak province with various education levels and teaching at various school levels. The data in this study was collected through “Competency in Using Web 2.0 Tools" and "Teachers' Self-Efficacy Perceptions" scales. Correlation and two-factor ANOVA analyses were used to determine the outcomes after verifying the data's normal distribution and the scales' fit indices. According to the study's findings, scores on the "Web 2.0 Tools Usage Competency Scale" were higher in favor of teachers with a master's degree. It was concluded that teachers' usage levels of Web 2.0 tools were significantly related to classroom management, one of the sub-dimensions of the teachers' self-efficacy perception scale, and their educational level, one of the demographic characteristics of the teachers. Furthermore, when the self-efficacy measure sub-dimensions were examined, it can be concluded that teachers' levels of the use of Web 2.0 tools did not differ significantly by school level or educational level, but they did differ significantly in terms of classroom management. The research findings also offer suggestions.