This study was conducted to (a) examine the correlation, coefficient matrix of internet usage with social connectedness, life contentment and learning achievement of undergraduate university students, (b) evaluate the impact of internet usage on social connectedness, life contentment and learning achievement of undergraduate university students, and (c) determine the gender differences in internet usage, social connectedness, life contentment and learning achievement of undergraduate university students. It was a descriptive study and adopted a survey approach. Its population consisted of undergraduate university students of the Departments of Social Sciences of the Bahuddin Zakariya University Multan, Pakistan. A sample of 300 students evenly divided into gender (150 male students & 150 female students) was taken conveniently from the population. The data were collected by using Internet Usage Scale (Wanajak, 2011), Social Connectedness Scale (Lee and Robbins, 1995), Contentment with Life Assessment Scale (Lavallee, Hatch, Michalos and Mckinley, (2007); whereas, learning achievement was measured through CGPA obtained by students. Results indicated significant correlations of internet usage with social connectedness, life contentment and learning achievement. Findings also demonstrated that internet usage has a significant impact on social connectedness, life contentment and learning achievement of undergraduate university students. The significant difference appeared regarding gender of the respondents in the level of internet usage and social connectedness, whereas no gender differences were found regarding life contentment and learning achievement of the undergraduate university students.