Folklore - Instant Messenger - really are 7 degrees apart.
Why does it matter that people from around the world are closely tied
together? Researchers said that the knowledge might have applications
for political organizations, charity efforts, natural disaster relief
and missing-person searches.
"They could create large meshes of people who could be mobilized with the touch of a return key," Horvitz said.
It also means that, strictly speaking, six degrees of separation
might be just a bit off. It's closer to seven, at least in their study
"For a piece of folklore, it wasn't bad," said Duncan J. Watts, one
of the Columbia researchers, now at Yahoo Research. "It was off only in
its detail."
The Microsoft Messenger project, which was presented at a technical conference in Beijing in April, went further.
"To our knowledge, this is the first time a planetary-scale social
network has been available to validate the well-known '6 degrees of
separation' finding by Travers and Milgram," the researchers said.
For the purposes of their experiment, two people were considered to
be acquaintances if they had sent one another a text message. The
researchers looked at the minimum chain lengths it would take to
connect 180 billion different pairs of users in the database. They
found that the average length was 6.6 steps and that 78 percent of the
pairs could be connected in seven hops or less.
Some pairs, however, were separated by as many as 29 hops.
"Via the lens provided on the world by Messenger, we find that there
are about '7 degrees of separation' among people,'' they wrote.