The most common claim is defamation. This applies when a false statement of fact is published online that harms someone’s reputation. It doesn’t matter if the poster intended harm; the key is that the statement was false and damaging. The person harmed can sue the original poster and, in some cases, those who repeated the statement. Truth is a complete defense, meaning you cannot be liable for defamation if the statement is proven to be true.

Schools can be legally responsible for peer bullying or harassment if it is based on a protected category like race, disability, or sex, and the school is deliberately indifferent. This means school officials know about the serious harassment and fail to take meaningful action to stop it. The school is not liable for every single argument between students, but it has a duty to address severe, ongoing harassment that creates a hostile environment and interferes with a student’s education.

Medicine cases often involve different defects, such as a dangerous manufacturing error, an unsafe active ingredient, or a failure to provide adequate warning about risks. These are typically “product liability” claims focusing on a design or warning flaw, rather than a bacterial contamination. The evidence relies heavily on scientific and medical expert testimony to prove the drug was unreasonably dangerous and caused the specific adverse reaction or injury.

The critical difference is the level of fault the claimant must prove. A private person only needs to show the defendant was negligent—that a reasonable person wouldn’t have published the false statement without checking the facts. A public figure (like a celebrity or politician) or a public official must prove “actual malice.“ This means showing the defendant knew the statement was false or seriously doubted its truth but published it anyway. This higher standard, set to protect open public debate, makes it significantly harder for famous people to win defamation cases.