In the last decade, the Internet's potential for promoting social movements has come to much public and academic attention. More and more Taiwan's social movement organizations, including environmental protection organizations, have recognized this potential and have sought to use the Internet to help activate their movements. However, in fact, there is a gap between the expectations of these organizations, as well as those of academics, and the reality as to what benefits the Internet actually provides them. Therefore, this research clarifies both the abilities and the challenges or problems of using the Internet to facilitate social movements by examining the experience of Taiwan's eight environmental organizations. Further, through interviewing online movement experts, this study also seeks to provide some suggestions to improve these environmental movement organizations' online use for activating social movements.