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The analysis of social media content for the extraction of geospatial information and event-related knowledge has recently received substantial attention. In this article we present an approach that leverages the complementary nature of social multimedia content by utilizing heterogeneous sources of social media feeds to assess the impact area of a natural disaster. More specifically, we introduce a novel social multimedia triangulation process that uses both Twitter and Flickr content in an integrated two-step process: Twitter content is used to identify toponym references associated with a disaster; this information is then used to provide approximate orientation for the associated Flickr imagery, allowing us to delineate the impact area as the overlap of multiple view footprints. In this approach, we practically crowdsource approximate orientations from Twitter content and use this information to orient Flickr imagery accordingly and identify the impact area through viewshed analysis and viewpoint integration. This approach enables us to avoid computationally intensive image analysis tasks associated with traditional image orientation, while allowing us to triangulate numerous images by having them pointed towards the crowdsourced toponym location. The article presents our approach and demonstrates its performance using a real-world wildfire event as a representative application case study.With the general public nowadays having at its fingertips technology that a few years ago was available only to advanced computing laboratories, it is only natural that the amount of crowdsourced information of computational merit is rapidly growing, with volunteered geographical information (VGI) being a large portion of this content (Goodchild 2007). Both domain experts and amateurs alike can now generate and disseminate geospatial content 2 G Panteras, S Wise, X Lu, A Croitoru, A Crooks and A Stefanidis

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