单词virality
网络: 扩散性；病毒式营销；病毒性
"I think the best kind of virality, " he said, "is a product that people like so much that they just want to tell people about it. "
“我认为最好的病毒式营销，”他说，“是这个产品让用户如此喜爱以至于他们想告诉其他人这个产品。”
Colleges are hotbeds of virality in more ways than one, and starting off there is a good move for any social app.
从多个角度来看，对于任何的社交应用来说，高校都是活力滋长的地方。