I don't think it fair to just blame 'social' media for the hysterics. 'Mainstream' media was just as bad. Anything to generate clicks/sales/retweets regardless of consequences. There are plenty of people who do rely solely on social media as their source of information though, plus the bloke down the pub. Or as
@AM9 most excellently phrases it "those whose only access to information was from the equivalent of graffiti on public toilet walls".
Without reading back, wasn't there a 'reasonable worst case scenario' of rolling, scheduled power cuts? That is not random blackouts but the scheduled cutting off of power for set periods based on the rota which someone here (and nowhere else) kindly pointed us in the direction of ie the letter in a box on your bill. Personally, I would like to be told about reasonable worst case scenarios, in the same way I would like to be told the chances of a medical procedure being unsuccessful and/or the possible side effects. I may not be able to do anything about it happening but I can at least make some reasonable preparations to mitigate some of the impacts.
What I find most unacceptable is the lack of a sensible response from the government / those in charge in properly explaining the situation following the hysteria in the media. Much as I found the response to the fuel panics, food panics and toilet roll hysteria equally hopeless. Did anyone stop trying to panic buy toilet roll or tinned beans as a result of the government reassurances or did it just ensure even more people went out to panic buy?