Flickr

Flickr is an image and video hosting website, web services suite, and online community platform. In addition to being a popular website for users to share personal photographs, the service is widely used by bloggers as a photo repository. , it claims to host more than 3.6 billion images, up from 3 billion in November 2008.

Map sources
In addition to using commercial mapping data, Flickr now uses OpenStreetMap mapping for various cities; this began with Beijing during the run-up to the 2008 Olympic games. As of October 2008[update], this is used for Baghdad, Beijing, Kabul, Sydney, and Tokyo. OpenStreetMap data is collected by volunteers and is available on a CC-BY-SA 2.0 license from Creative Commons.