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http://en.wikipedia.org/wiki/Fair_use

"[A] reviewer may fairly cite largely from the original work, if his design be really and truly to use the passages for the purposes of fair and reasonable criticism. On the other hand, it is as clear, that if he thus cites the most important parts of the work, with a view, not to criticize, but to supersede the use of the original work, and substitute the review for it, such a use will be deemed in law a piracy...
In short, we must often... look to the nature and objects of the selections made, the quantity and value of the materials used, and the degree in which the use may prejudice the sale, or diminish the profits, or supersede the objects, of the original work.

For the most part quoting a single part of an article (of a larger sized article) should be withing the borders of "fair use." Complicating things is international private law, I do not know for example australian law and if it has some sort of fair use principle. I know there is a convension most countries of the world has agreed to, "bern convention" but have not read this. In Norwegian law, I belive you are allowed to quote a paragraph in a litterature work. "Sitatretten" (directly translated to quoteright.) To be on the safe side I think people should do like odyd12 is writing and simply link to the article and make your own commentary.