Materials, data, and supplementary materials of Van Koningsbruggen, G.M., Hartmann, T., Eden, A., & Veling, H. (2017). Spontaneous hedonic reactions to social media cues. Cyberpsychology, Behavior, and Social Networking, 20, 334-340. Abstract: Why is it so difficult to resist the desire to use social media? One possibility is that frequent social media users possess strong and spontaneous hedonic ...