This interactive workshop introduces participants to several key theories from social psychology and sociology in order to demonstrate how science can be used to design engaging social media applications and campaigns.The content is presented in a simple format that makes key linkages between our daily social lives and the social world in social media. During the workshop, participants have a chance to learn a number of theories, see examples of how they play out online, and then join a group analysis on the social psychology employed by a number of social media sites and mobile apps.