Social networking sites like Facebook (www.facebook.com) and Twitter (http://twitter.com) have become among the most popular sites on the Internet. People of all ages use them to talk about their lives and keep in touch with friends and acquaintances. In addition, when people have experienced a traumatic event, they often use these sites to seek out others who have had similar experiences, and to find support and information on posttraumatic stress disorder. In the direct aftermath of a disaster, such as the earthquake in Haiti in 2010, especially in the absence of functional telephone and television cables, these sites have been used by survivors to find immediate assistance and resources as well as to inform the rest of the world about what is happening. Mental health professionals have also begun to use such websites to give support to their patients or to network with colleagues from the same area. And so, in the study of the Internet in mental health, the importance of these social networking sites cannot be ignored.