Flickr Commons marks 5-year anniversary with galleries of most-viewed pics

Flickr Commons is five years old, and to celebrate, Flickr has created galleries of the most viewed, 'favorited' and commented-upon images. Commons was launched in 2008 with 1500 photos, in partnership with the US Library of Congress. Five years later, the collection of public domain photographs boasts more than 250,000 images. Click through for more information, and links to the galleries of most popular images in the growing collection.