The authors develop a four-dimensional scale to measure members'satisfaction with virtual communities. The dimensions consist ofmembers' satisfaction with member-member interactions,organizer-member interactions, organizer-community interactions, andthe community's site. Using a sample of 3605 members of a virtualcommunity the authors investigate the effect of each satisfactiondimension on member participation and the moderating effect ofmembership length on the links between the satisfaction dimensions andmember particip ation. The results reveal that satisfaction withmember-member interactions, organizer-member interactions and thecommunity's site have positive effects on member participation.Satisfaction with organizer-community interactions has no effect onmember participation. The findings also show that the linkages betweenthe satisfaction dimensions and member participation are moderated bymembership length.