After elbowing its way into hospitals and restaurants, it was inevitable that IBM's supercomputer would turn its attention towards the retail business. IBM has launched Watson Trend, a service that harnesses Watson's deep learning smarts in order to discover the hottest and most desirable products to buy this holiday season. The machine will work out what's hot (and what's not) by trawling the web, looking through everyone's public conversations on social media, blog posts and product reviews. Once the information has been found, it'll run sentiment analysis to determine how people really feel about their new smartphones, TVs and tablets to work out the ones folks love the most.