Today's technology allows easier understanding of course activity and increasing motivation to learn. The Six Thinking Hats model, combined with the use of social media to enhance critical thinking abilities of learners. This framework is considered to be effective in promoting motivation and encouraging interaction between learners and teachers as well as among peers. This study was quasi-experimental research that compared critical thinking abilities and motivation between groups of learners being taught through small group discussions with and without the support of the Six Thinking Hats in social media respectively. The instruments in this study comprised tests, a questionnaire, and an open-ended question. The findings indicate that students in the experimental group achieved significantly higher critical thinking abilities than those in the control group. Also, motivation was statistically found to be higher in the experimental group after the intervention. That is, the use of the Six Thinking Hats in LINE online chat system was more effective in improving learner motivation. The results from the open-ended question reveal that the students were very satisfied with the Six Thinking Hats technique, movie clips, and the use of LINE as a learning tool.