Due to me being unable to post a comment in response: 

What interests me about these organizations is the fact that, from a libertarian perspective, they are non-governmental entities advocating for censorship of other non-governmental entities’ disseminations of media, and are willing to use a sort of "denial of service" of the latter through boycotts, pickets and intense propaganda campaigns.

In the eyes of the most ardent anarcho-capitalist, this is still "nonviolent" pressure because the censormongers are not physically touching their targets or threatening to do so, and the targets can adapt by either acquiescing to the pressure or finding an alternative niche to which they can appeal, abandoning the censormongers; from any other perspective, however, the pro-censorship campaigns are using a threat of delegitimization in order to enshrine an existing privilege against those who are playing host to or servicing segments or markets in the populace who are not as gung-ho about the preservation of privilege. It is the act of the powerful (or those who believe or wish themselves to be powerful) delegitimizing the less-powerful for no reason other than the preservation or gaining of their privilege and the misplaced calming of their inner insecurities.

It is the sort of "chilling effects" behavior which hate groups tend to exercise on a constant basis, and the censorship advocated by these sorts of organizations tends to hardly be susceptible to resistance unless the audience can be persuaded, in the long run, to ignore the tantalization of the salacious pro-censorship campaigns.