This is the eBook version of the printed book. If the print book includes a CD-ROM, this content is not included within the eBook version.What is an avatar? Why are there nearly a billion of them, and who is using them? Do avatars impact our real lives, or are they just video game conceits? Is an avatar an inspired rendering of its creator’s inner self, or is it just one among millions of anonymous vehicles clogging the online freeways? Can we use our avatars to really connect with people, or do they just isolate us? And as we become more like our avatars do they become more like us?