社会软件的第三个主要模式就是是社区活动。
The third major pattern in social software is community activity.
在当地时间的8点30分(即如下图所示)，为支持第三个地球一小时活动日，整个街区变暗了。
At 8:30 local time, soon after this picture was taken, the district went dark in support of the world's third Earth Hour.
在当地时间的8点30分(即如下图所示)，为支持第三个地球一小时活动日，整个街区变暗了。
At 8:30 local time, soon after this picture was taken, the district went dark in support of the world's third Earth Hour.
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