I disagree with number eight if you're trying to say that there is such a thing as bad publicity which a link could provide. I quote people. I include a link. I do this all the time. It is like a commercial. Ronald McDonald performs at birthday parties for free. Because marketing is valuable. That is what a link is. In other words, a link is a plug. It is valuable. That is why companies pay millions of dollars for ad time on television, on YouTube, on billboards, etc, as opposed to television shows giving the corporations money.
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