Social Networking: These are dedicated virtual communities where people can collaborate on a social as well on a professional basis.
社会网络：这些网络是专用的虚拟社区，其中人员可以按社会或专业进行协作。
Considering the hundreds of online friends people tend to accumulate on these social networking sites, those time savings really add up.
社交网站上在线朋友成千上万，这些节省下来的时间是可以积少成多、大有用处的。
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