Want a free movie ticket? Sign up for Atom Tickets, a new mobile app that allows users to instantly search for films, read reviews, connect with friends, buy tickets, pre-order concessions and more.The free app, which recently launched in 70 markets throughout the country, including Baltimore, is available in the Google Play Store and the Apple App Store.Regal Cinemas, AMC Theatres and Studio Movie Grill are celebrating the launch by giving Atom Tickets users a free movie ticket.For more information, visit atomtickets.com.