That could be a part of it, but groups are usually too complex to reduce to a single dimension. As an outsider, I often browse NYT and Fox News and am struck by

That could be a part of it, but groups are usually too complex to reduce to a single dimension. As an outsider, I often browse NYT and Fox News and am struck by how utterly different front page coverage is. I don't mean the tone of coverage, just the articles and categories that make it to the front page, which either reflect an editorial bias and/or what's getting eyeballs.