Abstract: Disclosed herein is a computer system for rendering targeted advertisements. The computer system includes a Web crawling module that generates product information based on product reviews obtained from product review Websites. The computer system also includes a content management module that receives audience metrics and user interest data from a digital sign. The audience metrics describe features of people in the vicinity of the digital sign, and the user interest data is received from a mobile device in the vicinity of the digital sign. The computer system also includes a data miner to correlate the product information, the user interest data, and the audience metrics to identify an advertisement likely to appeal to the user of the mobile device.