Flickr
I chose the website Flickr.
I chose Flickr because it is both a site that I enjoy, and a good example of a social website. It has millions of active users all adding photos or tagging other people's pictures, constantly improving the site.
The site provides photos. One can search for almost anything and find relevant photos.
The site gets this information from its users. Anyone can sign up. From there they can upload their own photos, and add relevant tags to those photos. They can also tag other people's photos.
The site is very easy to use, with a powerful search engine that lets users look for whatever they want. Results are then displayed in a friendly, accessable format. Results can also be sorted by how recently the photos were added, how relevant the tags on it are to your search term, or how "interesting" it is - which factors in many things, such as comments, click throughs, and favorites.
While not exactly the same, Google Images competes with Flickr in certain respects. If you are just trying to search for a photo, and do not want to add your own images, Google Images can provide this functionality.
Because Google searches practically the entire internet, and then shows all the images that it encounters in the Google Images, there are more photos known to Google Images than there are to Flickr. For example, searching for "food" gives you about 2,980,000 results on Google Images, while Flickr only comes up with 906,279. So, in terms of the sheer number of images available, Google Images beats Flickr.


