Flickr is a photo sharing website and web services suite, and an online community platform. It was one of the earliest Web 2.0 applications. In addition to being a popular Web site for users to share personal photographs, the service is widely used by bloggers as a photo repository. Its popularity has been fueled by its innovative online community tools that allow photos to be tagged and browsed by folksonomic means. It hosts over 2 billion images.
In March 2005, Yahoo! Inc. acquired Ludicorp and Flickr.
Flickr asks photo submitters to organize images using tags (a form of metadata), which allow searchers to find images concerning a certain topic such as place name or subject matter. Flickr was also an early website to implement tag clouds, which provide access to images tagged with the most popular keywords. Because of its support for tags, Flickr has been cited as a prime example of effective use of folksonomy.
Alexa: 38 | Pagerank: 9 | Google links: 1,530,000 | Yahoo links: 29,370,677 | Google index: 73,300,000 | Yahoo index: 355,553,224