This chapter begins by considering how the interviewees have used computer-mediated communication (CMC) to mobilise participation. It explains the use of CMC to assist (international) networking and the organisation of environmental activism. In addition to mobilisation, CMC has been used by the interviewees to facilitate networking and to boost solidarity among activists. CMC has been used by activists to create, or reinforce existing, linkages with other groups, both nationally and internationally. There were significant impediments to the use of CMC in mobilising participation and in developing new global linkages. A key hindrance to the use of CMC to mobilise participation was the poverty of online engagements. Interpersonal relations can be difficult via email, and online involvement can be transitory. The chapter concludes that rather than mobilising new cohorts of participation CMC serves to strengthen existing networks.