The creation of Reactions allows Facebook users to provide emotional support for members within the social network as well as disclose emotions toward various content. This research study investigated how this one-click tool is appropriated depending on the content of the posts and relational intimacy with the poster and the implications this one-click tool has for self-presentational concerns associated with emotional expression on SNSs. I found that on the whole, people use a greater number of positive Reactions than negative Reactions. In addition, self-presentational concerns were apparent when people used this feature to express emotions. Because of its lightweight nature, however, Reactions appear to be used less as a tool for social support unlike its counterpart, the “Like” button. Feelings such as ‘sad’ and ‘haha’ were particularly used more for emotional expression toward informational and entertaining posts broadcast on the NewsFeed.