May i ask, what would you consider those limits to be?

Those limits are set forth in case law. In Whitney v. California, for instance:

That the freedom of speech which is secured by the Constitution does not confer an absolute right to speak, without responsibility, whatever one may choose, or an unrestricted and unbridled license giving immunity for every possible use of language and preventing the punishment of those who abuse this freedom, and that a State in the exercise of its police power may punish those who abuse this freedom by utterances inimical to the public welfare, tending to incite to crime, disturb the public peace, or endanger the foundations of organized government and threaten its overthrow by unlawful means, is not open to question.
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