Internet discussion forums provide opportunities for largely anonymous communication among participants. The extent to which these opportunities are taken up is of particular interest in cultures where gender relations are highly regulated and cross-gender communication is strictly limited, such as in Saudi Arabian society. This article studies participation in a public discussion forum of expatriate Saudi students. It focuses on the nature of information (whether accurate or not) that participants choose to reveal about themselves, and its effect on the forum participation. Particular attention is paid to whether and how the gender of the participants is revealed. The analysis demonstrates that few participants take advantage of the possibility of not revealing gender. Rather, gender is emphasized in most usernames and can usually be deduced from the message content. Although there is no pressure to reveal name, age, marital status, etc., reactions to the rare messages Abeer Ahmed Madini is from the School of Languages and Comparative Cultural Studies, where the gender of the writer is not indicated show that clues to gender are considered essential to all but the briefest exchanges. This encourages participants to limit contact with participants of the opposite sex, as a result of which the forum communication remains largely gender segregated.