Whereas the role of social media in political activism has received much attention in recent years, the role of social media images remains largely understudied. Given the potential of emotional and efficacy-related visual content for motivating activism, this exploratory content analysis examined the content of Twitter images of the 2011 Egyptian revolution. The analysis of 581 images revealed more efficacy-eliciting (crowds, protest activities, national and religious symbols) than emotionally arousing (violent) content, especially posted by Egyptian users. However, emotionally arousing content decreased, whereas efficacy-eliciting content increased at times of instability. Furthermore, popularity of images was more associated with user information than the content itself. Images posted by activists and users outside Egypt received the most attention. The findings are discussed in terms of possible explanations for the content patterns and their potential impact on Twitter audience, as well as their contributions toward establishing a theory of user-generated content during political movements.