With the rapid growth of the Internet, new communication forms have emerged. This study examines how friendships are developed in a special kind of virtual world: multi-user-dungeons (MUDs). According to the Social Information Processing perspective (Walther, 1992) people learn to verbalize online that which is nonverbal offline, with increasing time. The use of verbal paralanguage should be an important factor in the development of impressions. Sociability, as a general trait, and skepticism towards computer-mediated communication (CMC), as a situation-specific attitude, could also influence this process. One hundred and three MUD users completed a questionnaire concerning their online friendships, MUD use, attitude about MUDding, use of paralanguage, sociability, and skepticism toward CMC. Seventy-seven percent of the MUDders reported relationships with others. Results supported the Social Information Processing perspective: Sociability had little influence, whereas skepticism towards CMC was an important predictor.