What are the ways in abusing the freedom of speech?

The first amendment of the constitution IS freedom of speech. BUT... You cannot threaten ANYONE with bodily harm (threats against the President of the United States) will certianly land you in jail, at least! You cannot threaten lawsuits, this can negate any such suit. You cannot lie about anyone as this would cause liable/ slander. You cannot give out personal information that would embarrass or invade the security of a person as this could be an invasion of privacy and you cannot give out false information for the purpose of insighting a riot or riotous atmosphere because that also is against the law. Asside from those things I just mentioned. I think you might be ok. But I'm not a lawyer.