I don't remember seeing him post anything about calling for a blackout, but his posts definitely kicked off my awareness and I think many others as well. I'd be very interested to see if he mentioned it before the 10th, which IIRC (probably not - it may have been 8th or something) is when there was a tipping point and a bunch of mods announced they'd be going black. It seems against his personality, he doesn't seem like the type to call for action like that. Tried googling it but didn't find anything during a quick search