The present study was undertaken to explore and compare the purpose of online social networking of 60 extrovert and introvert adolescent boys. Introversion-Extroversion inventory was utilized for sample selection. An inventory on online social networking was developed and utilized to assess the purpose of online social networking of extrovert and introvert adolescent boys. Percentage, mean percentage and t-test were computed for analysis of data. The results of the study revealed that purpose of online social networking in majority of extrovert and introvert boys was almost similar with little difference in few cases. It was observed that there was significant difference between introvert and extrovert boys with respect to purpose of online social networking.