Why aren't links allowed in your responses if it pertains to the discussion?

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I started a discussion regarding the chances in which Wrigley Field will be torn down (given new owners of the field as well as the team). The original discussion had no links in it; however, I referred to an article printed in the Chicago Tribune that stated, "Wrigley Field is a dump," and needs to go. A few respondents of the discussion (non Chicago residents, I might add) were interested in reading the article; therefore, to further the discussion and satisfy my respondents' curiosities I posted a link to the article in a response of my own. Low and behold, my response was deleted (I'm assuming by administration). What's the reasoning behind this? Does anybody have a clue? I'm not trying to promote anybody or any business, but rather give a little more background information on the subject (upon the request of the respondents). Why can't we do this without interference from whomever?