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Just for the sake of argument - could you give an example of malice that a student might write on a site like that? Would a false accusation or a racist comment fall under that?
You can find a general definition of malice online, but it is generally a statement, which is false, that tends to damage a person's reputation/profession, etc. As I said though simply being false is not the only element to consider as a possible Cause of Action.
Defamation "per se" requires no damages, as it is defamatory on it's face, such as a person is known to have a venerial disease when they do not.
Per quod defamation, as we are discussing, requires damages be proven.
A racist comment could be defamatory, yes, it would greatly depend on what was additionally said, but just calling a person a racist name is not defamation. A false accusation is one element of MALICE, yes.
Look up Jerry Falwell and his suit against Hustler magazine. It went to the US SC. Larry Flynnt said he had an incestual rendevous with his mom in an outhouse. The SC ruled Falwell as a "public figure" and Malice was neccessary to prevail, as it was intended as a parody,
evn though it was a lie.