This articlecompares two extended interactions that took place recently on the Internet, one from a recreational Internet Relay Chat (IRC)channel, and the other from an academic listservdiscussion group. The two interactions exhibit similar gender dynamic s, which can be characterized as harassment of female by male participants. This harassment takes different forms, in keeping with the possibilities inherent in the two modes of computer-mediated communication. Whereas female participants on IRC are kicked off the channel, in the discussion group harassers must rely exclusively on language to intimidate and silence. This ª rhetoric of harassmentº crucially invokes libertarian principles of freedom of expression, constructing women’s resistance as ª censorship.º A rhetorical analysis of the two harassment episodes thus sheds light on the means used to construct and maintain asymmetrical gender and power dynamic s in different modes of CMC.