Facebook application is already pre-loaded in any smartphone, making it a typical conversation mode almost anytime and anywhere. Its unique feature called "Facebook group" allows anyone to post images, documents, pdf files, PowerPoint presentations, and video clips. Even polls can also be posted where members of the group can simply click their response to a given poll question. Indeed, the Facebook group is already utilized by almost any organization. Many mathematics educators have already taken advantage of its utility to deliver learning materials to their students. This research study utilized the Facebook group in the mathematics teaching-learning process and students' cooperative learning experience. It is an avenue to discuss topics and other issues relevant to their existence. The students learned a new lesson through this phenomenal and modernized communication tool. Results of the investigation are presented in this paper.

Keywords: Teaching-learning mathematics, Facebook group, Online cooperative learning, Mathematics education, Experimental study.

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