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Nowadays, large-scale networked social media need better search technologies to achieve suitable performance. Multimodal approaches are promising technologies to improve image ranking. This is particularly true when metadata are not completely reliable, which is a rather common case as far as user annotation, time and location are concerned. In this paper, we propose to properly combine visual information with additional multi-faceted information, to define a novel multimodal similarity measure. More specifically, we combine visual features, which strongly relate to the image content, with semantic information represented by manually annotated concepts, and geo tagging, very often available in the form of object/subject location. Furthermore, we propose a supervised machine learning approach, based on Support Vector Machines (SVMs), to automatically learn optimized weights to combine the above features. The resulting models is used as a ranking function to sort the results of a multimodal query.