The informal social network plays an important role in the social support system for vulnerable jobless groups.

但是，这种非正式社会网络的社会支持作用是有限度的。

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I have defined the social capital into two parts basing on the theory of economy development: the capital from economic development and the capital from network externality of informal social network.

笔者在经济增长理论的基础上，将社会资本分成两部分，分别是由经济生产产生的社会资本以及由非正式社会网络的网络外部性产生的社会资本两个部分。

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Shervin Pishevar, the founder of Social Gaming Network and an informal investor in Chatroulette, had taken Andrey under his wing.

NEWYORKER: Roulette Russian