2004 February 10th
Ludicorp launched a photo sharing community website called Flickr. In March 2005, Flickr was bought by Yahoo!. Flickr is a typical representative of Web 2.0, which means that the content of the website is created and shared primarily by the users themselves. Flickr was one of the first community websites which allowed tagging of photographs. In 2015, the number of photos posted on Flickr exceeded 10 billion.