People are being overwhelmed by emails and marketing from different sites and companies about brand-related communications. You have the groupon and gilt-a-likes sending you discount and promotions every day. At the beginning people liked the idea and open and read every email. After a while people started to feel overwhelmed and aggregating sites started to become popular. Nevertheless there is no real solution today for the need of the people to communicate with their favorite brands.
The idea here is to create an application or portal that can provide some solution to this need. It could be a facebook app or several facebook apps too. I am more incline that it has to be something different. Something not related to facebook.
The size of this opportunity is relatively large. If successful it can become the sole communication channel for brands, avoiding any other type of new media communication. Everything would be centralized in one location where consumer know they can find what they are looking for. From information, to product and services.