The claim was not "there was several popular blogs that dealt with the topic of the Iraq War." The quote in full

>Why did blogging take off as a shared response to the US invasion of Iraq? (When “the Internet became an ideal valve to release opinions,” she writes, “who didn’t have an opinion on the Iraq war?”)

Basically claiming that blogging became popular because everyone wanted to share their opinion on the Iraq War. That's just not factual and, quite frankly, ridiculous.