Writing is one of language skills which is considered as a complicated skill to be mastered because it requires variety of abilities such as generating ideas, determining purposes, developing arguments, organizing and managing the text effectively, and revising draft. Due to that matter, this research proposed instagram as one of the effective tools used in blended learning to improve student’s writing. The aims of this study are to investigate whether there is any difference in student’s writing achievement after the students are taught by using Peer feedback via instagram , to find out which aspect of writing that improves the most after being taught by using Peer feedback via instagram and to find out what aspect of writing that students correct the most. This research used the one-group pretest-posttest design that involved 30 students of X IPS 4 class at MAN 1 Bandar Lampung in the 2019/2020 academic year. The writing tests were also used as the instruments to collect the data. The data obtained were analyzed by using paired sample t-test in which the significance level was determined by sign 0.05. With regard to the data analysis, the use of instagram can improve the Student’s writing achievement in all aspects of writing: content, organization, vocabulary, language use and mechanics. It is also found that content was the aspect of writing which improved the most. However, the aspect that the students corrected the most was language use.Keywords: writing, recount text, peer feedback via instagram, blended learning.doi: https://dx.doi.org/10.23960/UJET.v11.i1.202297
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