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Flickr

www.Flickr.com# is a social bookmarking site focusing solely on photographs. Amateur and professional photographers upload their favorite photos to share with friends and strangers, who can assign tags and add comments. Yahoo bought Flickr in 2005.

YouTube

YouTube is similar to Flickr but primarily features amateur and professional video content. After uploading, users can add comments and tags, and link to favorite videos from their own Web site. Google agreed to buy YouTube in 2006.

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