In this article we combine the perspectives of sociology and computer scien
ce to compare face-to-face (f2f) and computer-mediated communications (CMC)
from the viewpoint of their respective abilities to form and sustain commu
nities. We also identify a third type of community-a hybrid-that is based o
n a combination of face-to-face (f2f) and CMC, or off- and online communica
tions. The article thus in effect addresses an oft-asked question: Can virt
ual communities be "real," have the same basic qualities as f2f communities
? The article Is exploratory, because much of the necessary evidence has no
t yet been generated, and the relevant technologies are rapidly changing.