Nowadays the photo-capturing devices are no longer limited to digital cameras but include mobile phones, PDAs and others. This is leading to a new problem: a very large number of digital photos captured and chaotically stored in multiple locations without being annotated. This paper presents a new system, called PhotoGeo, for self-organization of georeferenced photos. The proposed system uses metadata and external sources to organize the photos. These external sources include a map-based social network and user’s calendar. Furthermore, spatial clustering and temporal segmentation techniques are used to join the photos into clusters with similar features.