You also have to think carefully about what a link is. Is a magnet link - essentially a hash of the content itself - a link? If so is posting the checksum of a piece of software copyright violation?
It would be like prosecuting the people who print the telephone directory for advertising drug dealers because some of their numbers are listed.
It's important to mention that in the UK this is an absolute offence. If the image is in your possession then it doesn't matter how or why it's there - intent is irrelevant.
This is important for people responsible for various servers, for example.
There are narrow exemptions - "I did not view the images and I did not know they existed" is one; "The images were unsolicited and I did not keep them" is another.
(See page 4)
(http://www.nominet.org.uk/digitalAssets/3249_Child_pornograp...)
I'll let you know if I get arrested.