8/6/2012 interview Ed Keller is co-author of ''Face to Face Book: Why Real Relationships Rule in a Digital Marketplace with Brad Fay. Ed insists, ''...the action is still off-line between people...'' He has been called one of the most recognized names in word of mouth and the publication of his 2003 book ''The Influentials'' has been called the seminal moment in the development of word of mouth.