A person of average intelligence and education, capable of understanding, and functioning within the society in which the alleged defamation occurred.
A reasonable person's opinion deserves consideration in a court of law, but a lunatic's does not.
Yes, spreading harmful and false information about someone can be considered defamation, which is a type of tort. If the gossip damages the person's reputation or causes them harm, they may have legal grounds to sue for defamation.
Whatever the jury considers reasonable for a person of ordinary care (in the jurisdiction) to have done (or not done) under similar circumstances. If everyone here'bouts knows something oughta be done, then it's the reasonable person standard, even if nobody elsewheres would do it that way.
A prudent person is considered to be one who is discreet or discerning to a great degree. A reasonable prudent person would then be one who does not go overboard with their prudence to the point of snobbishness, for example.
A false speech intended to damage a person's reputation is called defamation. Defamation can be in the form of slander (spoken defamation) or libel (written defamation). It involves making false statements about someone that harm their reputation.
Libel.
Defamation is speech that wrongfully damages a person's reputation. It includes both slander, which is spoken defamation, and libel, which is written defamation. To prove defamation, the statement must be false, harmful to the person's reputation, and communicated to a third party.
defamation constitutes damage that requires due process if law
An example of online defamation would be what would happen if I were to copy out a defamatory statement by someone and put it in this answer. Of course, I would then be republishing it and would be as liable as the person who first published the defamation.
No.
Knowingly and falsely harming another person's reputation.
Defamation is a civil wrong that involves making false statements about a person that damages their reputation. It can be classified as a tort when the false statements are communicated to a third party and result in harm to the person's reputation or livelihood.