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Google's acquisition spree is fast turning into one acquisition a day. Today they've agreed to buy Spain-based Panoramio, a photo mapping site that "links millions of photos with the exact geographical location where they were taken." The site already integrates Google Maps, and Panoramio had also been integrated into Google Earth - it's basically a social site for sharing photos around locations.
Bearing in mind the existing integration with Google services, this is really a case of Google taking a successful service in-house.