I didn't, actually, which is why that's the follow-on question (which, if not relevant to you, was meant for others reading to ponder).

The first question (slightly paraphrased) was:

  How do you prevent [the natural right of free speech] from overriding your efforts to restrict [speech in public fora] (word of mouth being the best advertising)?

Maybe I'm barking up the wrong tree. Is your intent not to limit the dissemination of "bad" (to be as broad as possible) ideas?