Build an aggregator website - similar to retailmenot.com

Hi, I am trying to build a minimalist website that crawls the internet and aggregates information based on a simple user input. User would input a specific word, name, object, or title, click enter, and then my website would return a list of three specific categories directly related to that word. More details on the specifics to come but this is the concept. Unlike kayak, there would be no bookings involved or any ecommerce transactions. Merely a simple first page like [login to view URL], that will provide a list of three specific categories and extracted information from other websites, along with direct links to those websites. That is all. Although the site will only function properly for the the United States initially, I prefer to use a content delivery network for a high quality customer experience and future expansion. [login to view URL] has a simple GUI that might be an effective example. Except I would want the first page to be only a search bar and the next page return the requested results in three categories.