There is no doubt that the popularity of smart phones has had an impact on the restaurant business. Customers have a way to express their delight in what they see by snapping images of their food and posting it on their own social media sites, or review sites like Yelp.There is no doubt that the popularity of smart phones has had an impact on the restaurant business. Customers have a way to express their delight in what they see by snapping images of their food and posting it on their own social media sites, or review sites like Yelp.