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In 2003, [[Columbia University]] conducted an analogous experiment on social connectedness amongst Internet email users. Their effort was named the Columbia Small World Project, and included 24,163 e-mail chains, aimed at 18 targets from 13 countries.<ref name="dodds">Dodds, Muhamad, Watts (2003)."Small World Project," Science Magazine. pp.827-829, 8 August 2003 https://www.sciencemag.org/content/301/5634/827</ref> Almost 100,000 people registered, but only 384 (0.4%) reached the final target. Amongst the successful chains, while shorter lengths were more common some reached their target after only 7, 8, 9 or 10 steps. Dodds et al. noted that participants (all of whom volunteers) were strongly biased towards existing models of Internet users{{#tag:ref|"More than half of all participants resided in North America and were middle class, professional, college educated, and Christian, reflecting commonly held notions of the Internet-using population"<ref name="dodds"/>|group=Note}} and that connectedness based on professional ties was much stronger than those within families or friendships. The authors cite "lack of interest" as the predominating factor in the high attrition rate,{{#tag:ref|"suggesting lack of interest ... was the main reason" for the "extremely low completion rate"<ref name="dodds"/>|group=Note}} a finding consistent with earlier studies.<ref name="kleinfeld">{{cite web|url=http://www.stat.cmu.edu/~fienberg/Stat36-835/Kleinfeld_SWP.pdf|title=The Small World Problem|publisher=[[Society (journal)|Society (Springer)]], Social Science and Public Policy|author=[[Judith Kleinfeld|Judith S. Kleinfeld]], [[University of Alaska Fairbanks]]|date=January–February 2002}}</ref>

In 2003, [[Columbia University]] conducted an analogous experiment on social connectedness amongst Internet email users. Their effort was named the Columbia Small World Project, and included 24,163 e-mail chains, aimed at 18 targets from 13 countries.<ref name="dodds">Dodds, Muhamad, Watts (2003)."Small World Project," Science Magazine. pp.827-829, 8 August 2003 https://www.sciencemag.org/content/301/5634/827</ref> Almost 100,000 people registered, but only 384 (0.4%) reached the final target. Amongst the successful chains, while shorter lengths were more common some reached their target after only 7, 8, 9 or 10 steps. Dodds et al. noted that participants (all of whom volunteers) were strongly biased towards existing models of Internet users{{#tag:ref|"More than half of all participants resided in North America and were middle class, professional, college educated, and Christian, reflecting commonly held notions of the Internet-using population"<ref name="dodds"/>|group=Note}} and that connectedness based on professional ties was much stronger than those within families or friendships. The authors cite "lack of interest" as the predominating factor in the high attrition rate,{{#tag:ref|"suggesting lack of interest ... was the main reason" for the "extremely low completion rate"<ref name="dodds"/>|group=Note}} a finding consistent with earlier studies.<ref name="kleinfeld">{{cite web|url=http://www.stat.cmu.edu/~fienberg/Stat36-835/Kleinfeld_SWP.pdf|title=The Small World Problem|publisher=[[Society (journal)|Society (Springer)]], Social Science and Public Policy|author=[[Judith Kleinfeld|Judith S. Kleinfeld]], [[University of Alaska Fairbanks]]|date=January–February 2002}}</ref>

2003年，哥伦比亚大学对互联网电子邮件用户的社会联系进行了类似的实验。他们的工作被命名为 "哥伦比亚小世界项目"，包括24,163条电子邮件链，目标是涵盖13个国家的18个目标。<ref name="dodds" />几乎有10万人注册，但只有384人（0.4%）达到了最终目标。在成功的邮件链中，虽然长度较短的邮件链比较常见，但有些邮件链只经过7、8、9或10步就达到了目标。Dodds等人指出，参与者（他们都是志愿者）强烈地偏向于现有的互联网用户模式，基于职业关系的联系要比家庭或朋友关系中的联系强得多。作者指出，"缺乏兴趣 "是造成高流失率的主要因素，这一发现与早期研究一致。<ref name="kleinfeld" />

2003年，哥伦比亚大学对互联网电子邮件用户的社会联系进行了类似的实验。他们的工作被命名为 "哥伦比亚小世界项目"，包括24,163条电子邮件链，目标是传递到分布在13个国家的18个目标。<ref name="dodds" />有10万人注册，但只有384（0.4%）达到了最终目标。在成功的邮件链中，虽然长度较短的邮件链比较常见，但有些邮件链只经过7、8、9或10步就达到了目标。Dodds等人指出，参与者（他们都是志愿者）强烈地偏向于现有的互联网用户模式，基于职业关系的联系要比家庭或朋友关系中的联系强得多。作者指出，"缺乏兴趣 "是造成高流失率的主要因素，这一发现与早期研究一致。<ref name="kleinfeld" />

一些研究，如Milgram的小世界实验，已经被用来实证测量这种联系性。"六度分隔 "这一短语经常被用作 "小世界 "现象这一概念的同义词。

一些研究，如Milgram的小世界实验，已经被用来实证测量这种联系性。"六度分隔 "这一短语经常被用作 "小世界 "现象这一概念的同义词。