usefull links:

http://ryanscarry.com/photography-on-the-internet/
http://www.telegraph.co.uk/technology/advice/7590387/How-the-internet-has-changed-photography.html
http://jmcolberg.com/weblog/extended/archives/photography_copyright_and_plagiarism/
http://www.parallax8.com/featured/photography-and-the-internet-an-interview-with-joerg-colberg