In Crookes v. Newton, 2011 SCC 47, the defendant Newton had posted material on his website linking to other websites that contained defamatory material about the plaintiff Crookes. Crookes sued Newton on the basis that two of the links he created connected to defamatory material, and that by using those hyperlinks, Mr. Newton was publishing the defamatory information.
The Court concluded that:
Making reference to the existence and/or location of content by hyperlink or otherwise, without more, is not publication of that content. Only when a hyperlinker presents content from the hyperlinked material in a way that actually repeats the defamatory content, should that content be considered to be “published” by the hyperlinker.
[...] the use of a hyperlink cannot, by itself, amount to publication even if the hyperlink is followed and the defamatory content is accessed [...]As the plaintiff in a defamation suit must prove on that the defamatory words were "published", the use of a hyperlink to defamatory material, without more, is not defamatory.