Instagram is considered one of the most famous virtual social networks among all ages of human beings. Nowadays, the extensive popularity of social networking websites such as Instagram has made new chances for Iranian English teachers and learners. Accordingly, the present study tries to investigate whether Instagram would be a useful learning instrument of vocabulary for Iranian male EFL learners at the pre-intermediate at Shokouh Enghelab English Academy in Babol, Mazandaran, Iran. The participants in this study were 50 male EFL learners, ranging from 8-15 years old, selected randomly from 100 cases. After checking the homogeneity of the participants, they were divided into two groups. The participants in the experimental group were learning English vocabulary through ten Instagram pages for four weeks (12 sessions and 25 minutes per session). But the participants in the control group were only taught by the teacher. Pretest and posttest were applied to evaluate learners' knowledge about vocabulary during the session. Based on the research data, Instagram learning brings valuable technological and pedagogical advantages for Iranian EFL learners despite the popularity of social networks. It has a significantly positive effect on the development of vocabulary learning. The findings of this paper can be helpful in the English methodology issue.
