Shopify are having some technical issues this morning so a lot of our favourite storefronts are offline. See the Shopify status page here: https://www.shopifystatus.com. If you can't see a store's online shop then check back often for updates.
Appears to have started about 1/2 hr. ago. I'm guessing there are a lot of merchants who are freaking out by now.
I have a Shopify store, seems ok atm