Most (all?) of the Stack Exchange sites have dedicated Twitter accounts that tweet questions, pleas for answers, upcoming events, and so forth (e.g. @stackscifi, @stackcooking, @stackparenting, @stacksuper_user, @serverfault).
Does one of these exist for Stack Overflow? @stackoverflow is someone else, and @stackstackoverflow and @stack_stackoverflow don't exist.
@stackexchange follows all (?) of the individual accounts, and doesn't appear to follow one for Stack Overflow. I've tried searching Twitter, but there's so much Stack Exchange content on Twitter that even if the account did exist, I'm not sure it would be visible in the noise.