Teeth from ancient human ancestors suggest that females joined new social groups once they reached maturity.

从远古人类祖先牙齿显示，女性们一到成年就加入新的社会群体。

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New generation of migrant workers is the current new social groups, their marriage problems are ignored.

新生代农民工是当前新生的社会群体，他们的婚恋问题常被忽视。

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As Internet use rises in Brazil and reaches new social groups, better-off Brazilians are leaving Orkut for Facebook.

当因特网的使用在巴西呈上升趋势、并且延伸到新社交群组，境况较好的巴西人抛弃orkut，投奔Facebook。

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As internet use rises in Brazil and reaches new social groups, better-off Brazilians are leaving Orkut for Facebook.

ECONOMIST: E-communication and society

Facebook last month launched a new Groups feature, allowing users to create groups on the social network and add friends by tagging them in the group.

FORBES: Zuckerberg: Facebook Groups Is One Of Our Fastest Growing Products

Finnigan notes that Google Plus, the new Google social networking site, makes it easier to divide contacts into discreet groups like friends, family, and professional contacts.

FORBES: More Employers Using Social Media to Hunt for Talent