Social media applications have become popular methods of online communication, interaction, and social networking. Many people use social media websites and mobile applications, such as Twitter, to create and post personal expressions in public online forums. This online content presents opportunities for using social media as a data source with the potential to improve evaluation of theoretical models of emotional and stressful experiences across various topics and subfields of psychology science and practice. In this article, we discuss emerging information retrieval and analytic methods using social media for ecological momentary assessments of emotion. We describe 2 specific methods we have developed in the context of Twitter and their use in a broader study investigating relationships among people's emotional experiences, their expressions of experiences in social media, their daily geospatial movements and locations, and their stress experiences. We conclude with a discussion of potential applications and ethical considerations for these methods in professional psychology practice and science.
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