In many cases, teenagers who don't have mobile phone are excluded from the group of teenagers who do.

Girls have been found to be more likely to exclude others, boys tend to threaten with physical violence.

An 11-year-old American, Natalie recalled in an newspaper interview how every girl in a class but one was invited to a recent sleepover. The girls at the party went on the Internet that night and taunted the one who had been left out.