"I never thought of it as a photo of a smoking kid," Dors said. "It was just of a kid in Romania and how his life is. You can never make a serious documentary if you always have to think about what Flickr will delete."
There may be legitimate reasons to take action, such as to stop spam, security threats, copyright infringement and child pornography, but many cases aren't clear-cut, and balancing competing needs can get thorny.
"We often get caught in the middle between a rock and a hard place," said Christine Jones, general counsel with service provider GoDaddy.com Inc. "We're obviously sensitive to the freedoms we have, particularly in this country, to speak our mind, (yet) we want to be good corporate citizens and make the Internet a better and safer place."