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nginx/1.14.0 (Ubuntu) "This isn't your grandfather's photo-sharing site" is the tag line on flickr.com 's home page. But there's no reason for anyone of any age to be put off: the great appeal of this irreverent, 1-year-old start-up is just how easy its technology makes it to share your pictures.

The secret ingredient is Flickr's use of keyword tags. These can be attached to your photo files, making online albums as searchable as the Web itself. And with 80% of the site's 8 million photos open to the public (you can set your...