Defamation
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Legally speaking, defamation (which can include vilification, slander, and libel) is 'the communication of a statement that makes a false claim, expressively stated or implied to be factual, that may give an individual, business, product, group, government or nation a negative image'.
The fundamental distinction between libel and slander lies in the form in which the defamatory matter is published. If the offending material is published in a transitory form (e.g. spoken aloud), it is slander. If it is published in more durable form, including on the web, then it is considered libel.
Defamation is also the publication of private information where one person reveals a matter which is not of public concern, and which would offend a 'reasonable person'. Unlike libel or slander, truth is not a defence for invasion of privacy.
You are very strongly advised to seek specialist, legal advice if you have even a slight doubt that you might offend.
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