Corporate censorship of Al-Jazeera?

On March 24th, the arabic news station Al-Jazeera launched an English-language website (which so far I was unable to access). Supposedly, AOL and Yahoo! are refusing to run their advertisements.

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…at least according to this article in the Economist. This attitude amazes me, as the desire to get different opinions has nothing to do with being patriotic or not. In addition, many western news sources actually depend on Al-Jazeera.