Previous research about computer-mediated communication (CMC) focused on variables as gender. There is little information about differences in CMC related to personality, most are speculations based on the assumption that introvertive traits are specially appropriate for CMC. Results of this study are consistent with this predictions, because introverted participants sent as messages to the Internet forums analysed as extroverted, and their messages contained more information. In relation with gender, it was found that men sent longer messages that women, but there was not more information in them