No it is not illegal, but it is civilly actionable, someone can sue you for damages. A defense to a charge of libel (written slander) is truth. If it's true, you can defend your right to post it.
When they become threats that suggest harming a person.
Yes, it is illegal for someone to gamble on behalf of another person without proper authorization or consent. This is considered illegal gambling and can result in legal consequences.
If you are talking about mailing someone then yes it is illegal not to mention highly dangerous.
A person cannot be legal or illegal.
Yes.
Pharmacies yes. Person to person is illegal.
It is not illegal to screenshot a photo of someone if the photo is publicly available or if you have the person's consent. However, it may be considered a violation of privacy if the person did not give permission for the screenshot.
It depends on the context. Very generally speaking, it is illegal to point a gun at someone unless the person is doing something that warrants having a gun pointed at said person.
It is illegal to refuse emergency medical service, even if the person is an illegal immigrant
no course its not illegal but the person you say it to or someone else can report you on facebook and you can get your account deactivated the only way the police would get involved would be if it was consistent bullying
No, they deserve to be fired for what they did. It is not illegal to fire someone for anything.
Yes.