blacking out all the blogs they host (i.e. protesting against censorship by engaging in large-scale censorship) would be incredibly uncool and sure to do more harm than good.
At least some of the 35 million people that host blogs there. They also censored wordpress.org, which Quantcast says get 8 million monthly visits. All in all, the number of people that see the message will probably be in 7 digits.
