http://boingboing.net/2014/04/07/restoring-cc-attribution-to-fl.html
Interesting post by Cory Doctorow, particularly the ending:
"And if Yahoo doesn't do this, I think it's time to start thinking about
hosting CC images somewhere else -- perhaps Wikimedia Commons, or a
purpose-built site. [...]"
Hopefully it hasn't already done the rounds here.