Flickr 
(www.flickr.com)

Users: 5 million
Ages: 18 - 35

Background Information:Background Information

Flickr is a photo sharing and depository site. All photos are searchable by  tags or text that the originator attached to the photos.

Most photos are available to the general public, although there are settings to make photos available to only a select group of people.

There are an estimated 200 million photos on Flickr.