you asked...I'll tell you...
...it's actually when there is no mass communication that each voice had greater strength. In today's world Jesus' message would be drowned out by a billion voices on the web and Youtube. Even in 1970 Jesus' message would be fit between commercials and shifted far from prime-time, competing with catch jingles from Madison Avenue.
No, Jesus message and presence is far more a powerful influence on history because he said what he said in a time when literacy and goodness were rare attributes.
"No mass communication? Perfect! My message will last forever."
;-)