Social media study and analysis brings researchers from many fields into a single setting. Even though the tasks of these researchers are varied, data visualization and analytics plays an important role. For industry and academics alike, visualization of social media data helps with hypothesis formation and supports the explanation of phenomena. This second workshop on social media visualization is a venue for the presentation of research and applications of visualization to social media data. Its goal is to bring together researchers and industry practitioners interested in visual and interactive techniques for social media analysis, particularly in social sciences and humanities as well as in industry.