So searching through vast amounts of anonymized data, Contractor and his collaborators found that teens had online friendships that were disproportionately with people in their immediate geographic area -- likely with people they already knew.
"That finding really went against a lot of the media hype," Contractor said. "People were worried about helpless teenagers talking with strangers, but that is not what we found. This is the first time this has been based on solid evidence."
Teenagers also tended to be friends with the friends of their friends, not with people who weren't part of their network already, the researchers found.