Fan page promotions in the store with Google Glass

Imagine that you are in a store and can recognize a product with Google Glass (by scanning the QR or barcode) and all product information will be shown, such as the price, promotion price, size, stock, possible the delivery period and the possibility to order and pay online with Google Glass.
Scanning a QR code with your smartphone or tablet is already possible with Google Now since the integration of Google Goggles.

But wouldn’t it be nice if you as a fan of one of the popular social media, could enjoy an additional discount out of gratitude for membership when you subscribe to the newsletter via the website or blog. The stores and brands have the advantage to be able to communicate with you directly in a very cheap way, compared to the expensive ads and leaflets in the past.