The document discusses several social media platforms that restaurants can use for marketing and promotion: Foursquare, Google+, and Yelp. Foursquare allows customers to check-in at restaurants and share their locations, influencing friends. It reaches over 30 million users with billions of check-ins. Google+ is similar to Facebook and provides pictures, contact details, menus, and reviews for restaurants. Yelp has over 100 million viewers and provides reviews, ratings, and photos that can attract or deter potential customers to restaurants.