<![CDATA[Students' interest in social media especially Instagram is very high, and makestudents able to expression in accordance with what they want. This research design uses experiment with one- group pre- test method and post- test design. The location of the research is SMP Negeri 1 Arjasa. Respondents of this research are student in junior high school, ages 13 years-15 years, which have Instagram accounts, and students who have low self-confidence. Data collected using questionnaires and documentation. The data taken is the test data validity, reliability test. Analysis method using product moment and t- test. From the test result using α = 5% paired sample t- test, and data used is 24 students before treatment (pre- test) and 24 students after treatment (post- test). Number of samples N = 24 students The results of this study indicate that Ha accepted and H0 rejected. From these results indicate that Instagram-based information service is effective to improve students' selfconfidence.]]>
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