In one of Tom Peter's many free presentations on his website he had the following quote from his book "In Search of Excellence".
I found the quote in regards to communication distances troubling, but true.
Tom's quote goes:
"It was the only chart we used in In Search of Excellence! It arrived courtesy of the research by Tom Allen and his colleagues at MIT. Studying communication patterns, they discovered that people more than a hundred feet apart might as well, in terms of communication frequency, be 100 miles apart!. Internet or no Internet (these days), that is nothing short of … stunning! And the implications are nothing short of profound!"