Because Twitter allows reading without an account, I believe it would be a very suitable method for posting announcements/status if there is an event like a storm that shuts things down. As long as someone has Internet access, they should be able to get to Twitter and easily access any "SMC account" for that kind of information. It can easily be setup to cross post to Facebook, too, so those of us who participate there will get the news there.
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The most expensive tool is the one you buy "cheaply" and often...