%0 Thesis %9 Masters %A YENNY , RATNASARIE SY %B FAKULTAS KEGURUAN DAN ILMU PENDIDIKAN %D 2023 %F eprints:69286 %I UNIVERSITAS LAMPUNG %T MODIFYING THE USE OF INSTAGRAM BASED ON TPACK THEORY TO INCREASE STUDENT’S ABILITY IN WRITING CUTLINE CAPTION AT THE THIRD YEAR STUDENTS OF SMAN 1 JATIAGUNG SOUTH LAMPUNG %U http://digilib.unila.ac.id/69286/ %X Dealing with the rapid development of technology, teachers are possible to use social media as their learning media. In relation with this, instagram as one of the most used social media has often been modified from its original use as entertainment tool to educational tool, especially in teaching writing. In doing this, teachers need to do their teaching learning process using an appropriate learning theory as the framework, that is Technological Pedagogical Content Knowledge (TPACK). This study focused on modifying the use of instagram based on TPACK theory to increase students’ ability in writing cutline caption. The researcher did a research to find out whether the use of instagram based on TPACK theory can increase students’ ability in writing cutline caption or not. Also, the second objective of the research is to find out the writing aspect which has the lowest and the highest increase among five writing aspects namely organization, content, grammar, vocabulary and mechanic. This research is quantitative research where the researcher used one group pretest posttest design and one class from 12 grade students of SMAN 1 Jatiagung South Lampung as the sample of the research. The data was collected by doing pretest, treatment, and posttest. In the posttest, researcher asked the students to write a caption based on their own photo and upload it in their instagram account. The result indicates that the use of instagram based on TPACK theory can increase students’ ability in writing cutline caption. The result also shows that the average of five writing aspects increase well from pretest to posttest, for example organization (10.57 to 14.98), content (11.4 to 15.9), grammar (13.85 to 20.82), vocabulary (13.24 to 17.17), and mechanic (6.57 to 7.35). Thus, the highest increase is in grammar aspect and the lowest increase is in mechanic aspect. From those results, it is concluded that the use of instagram based on TPACK theory can significantly increase students’ ability in writing cutline caption, mainly in some aspects of writing. It is also suggested that further researcher may apply this matter to increase another English skill and all of writing aspect. Keywords: writing skill, cutline caption, instagram, TPACK theory