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Online Social Networks explode with activity whenever a crisis event takesplace. Most content generated as part of this activity is a mixture of text andimages, and is particularly useful for first responders to identify populartopics of interest and gauge the pulse and sentiment of citizens. Whilemultiple researchers have used text to identify, analyze and measure themes andpublic sentiment during such events, little work has explored visual themesfloating on networks in the form of images, and the sentiment inspired by them.Given the potential of visual content for influencing users' thoughts andemotions, we perform a large scale analysis to compare popular themes andsentiment across images and textual content posted on Facebook during theterror attacks that took place in Paris in 2015. Using state-of-the-art imagesummarization techniques, we discovered multiple visual themes which werepopular in images, but were not identifiable through text. We uncoveredinstances of misinformation and false flag (conspiracy) theories among popularimage themes, which were not prominent in user generated textual content, andcan be of particular inter- est to first responders. Our analysis also revealedthat while textual content posted after the attacks reflected negativesentiment, images inspired positive sentiment. To the best of our knowledge,this is the first large scale study of images posted on social networks duringa crisis event.

Visual Themes and Sentiment on Social Networks To Aid First Responders During Crisis Events