With more than 554 million active users, Twitter is one of the most popular social networking sites. Active users of social networking who are in a romantic relationship may find that Twitter-related conflicts cause relationship problems that can become serious enough to result in infidelity or divorce, as described in a study published in Cyberpsychology, Behavior, and Social Networking , a peer-reviewed journal from Mary Ann Liebert, Inc., publishers. The article is available free on the Cyberpsychology, Behavior, and Social Networking website until August 2, 2014.