The social media promotions over time have created an effect in the learning behaviour of students. Therefore, an attempt has been made to find out the usage of social media and how it affects the learning behaviour of the students undergoing under-graduation in agriculture with the objectives of finding the extent of usage of social networking sites by the undergraduate students and the effect of internet usage on students learning pattern. The study was conducted at Agricultural college and Research Institute, Killikulam. The final year and third year B.Sc (Agri) students are the respondents for the study. A total of 187 students were contacted for the study. The study revealed that the variables, accessibility to internet, and internet usage exhibited a positive and significant relationship with the effect of internet usage at five percent and ten percent level of probability respectively.