Instagram it’s frequently use as a learning resource because it is mostly used as social media among students. Instagram also provides English learning content and it can be found by the students to support their self-directed learning. This study aims to explore the contents of English learning on Instagram used by students at MAN 2 Magelang and their strategies in optimizing self-directed learning on vocabulary. This study uses qualitative descriptive design to get in-depth and detailed information about Instagram used as a resource for self-directed learning on vocabulary. There were 7 students of grade eleven involved as the participants with criteria have Instagram account and following English learning account. The Instagram account they follow are @studyenglish.id, @kampunginggrisjagoan, @englishpix, @ngocehenglishcom, @tipspedia.id, and @belajar_bahasa_inggris. This study use interview as a data collecting method in order to answer the formulation. After collecting data, the data was analyzed use data reduction, data display, and conclusion. The result shows that the students
mentioned their following Instagram accounts that provide English learning content for learn vocabulary. However, each participant has their own way in optimizing self-directed learning such as choosing interesting contents for learning vocabulary, selecting the contents that suits with their interest, taking notes of what they got from Instagram, practicing how to pronounce the new vocabulary in front of the mirror, choosing an effective tool for their self-directed learning, have free access the materials, and doing self-monitoring and self-evaluating on self-directed learning process. This finding highlights that students can finds Instagram accounts that share those English learning contents to support and optimizing their self-directed learning.