slander and libel are limitations of free speech. so are in the united states "fighting words". obscenity is also constitutionally not protected. there are also laws agains sedition.
im not saying that the law should be the standard by which free speech is measured, but the law points towards certain practical limitations of an ideal principle.
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edit: sexual harassment is another obvious limitation. imagine if a woman had to hear "hey baby, i want to fuck you in the ass and slice your throat while you cry" every day at work. free speech? i don't think so... [sorry for the unpleasant example, i was just trying to make my point crystal clear]
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