The actual article makes no references to hacking or defacing websites. It explicitly references outreach and legal protest. The poster of this link clearly has an axe to grind, and based on the number of kneejerk responses he was successful.
It's sort of ambiguous, but the sentence "Encourage friends, businesses, organizations, social media to take a stand along side us in the same way" implies voluntary cooperation. Without anything more explicit, it seems like they're talking about people voluntarily replacing their own front pages.
