Targets, who were randomly assigned by researchers from Columbia University in New York, lived in 13 countries. They included an Australian police officer, a Norwegian veterinarian, and a college professor.

　　Out of 24,000 chains, only 384 reached their goal. The rest petered out, usually because one of the recipients was either too busy to forward the message or thought it was junk mail.

　　The links that reached their goal made it in an average of 4.05 e-mails. Based on the lengths of the failed chains, the researchers estimated that two strangers could generally make contact in five to seven e-mails.

　　The most successful chains relied on casual acquaintances rather than close friends. That's because your close friends know each other whereas your acquaintances tend to know people you don't know. The phenomenon, known as the strength of weak ties, explains why people tend to get jobs through people they know casually but aren't that close to.

　　So, start networking and instant messaging now. As they say in show business: It's all about who you know.

　　6. If you want to get into touch with a stranger in the world, how many e-mails might it take for the message to reach him/her?

　　A. 5 to 7 B. 18 C. 13 D. 384

　　7. Which of the following is Not true about the test?

　　A. 24,000 people took part in the study and sent e-mails to people they knew.

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