The document examines whether geotagged photos from photo sharing websites can aid in map updating and change detection. It analyzes over 4 million geotagged photos across different sites in the UK. The analysis found that while some sites like Flickr provided good spatial coverage of popular areas, the overall coverage was not sufficient. Additionally, while the volume of photos was huge, the spatial distribution of changes over time was unclear from the implicit geotagged data alone. To be truly useful, a database would need both the large volume of implicit sources and the clear spatial coverage of explicit sources.