What is Picture or Online Photograph Sharing?
http://en.wikipedia.org/wiki/Photo_sharing

Picture Sharing Explained by Common Craft


Most of the Picture Sharing sites are excellent.
Some examples include
Bubbleshare
Flickr - what can we do with flickr? - http://flickr.com/photos/cogdog/265279980/
Photobucket
Picasa (Google)

Photo Sharing with Web2.0 technology allows students to comment on as well as share images. This allows students to work collaboratively on group projects in a positive constructivist manner.
Examples: