NewsForge has an interesting article that explains how Open source helps Flickr share photos. A quote from the article states that:

The list of tools Flickr employs reads like a Top 40 of open source projects. When you upload that adorable picture of your cat, it is resized by ImageMagick. The EXIF and IPTC metadata tags are extracted with Perl. Java is used for processing daemons and for FlickrLive, a real-time chat application. The Web pages you see are generated from Smarty templates and PHP scripts.

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