Firms that can harness powerful network effects, in which users encourage friends and family members to join them on a particular service, may be best placed to fight off the clones.

公司可以利用强大的网络效应影响，号召其客户和朋友与他们一道坚持使用一种服务，这也许是攻克克隆军团的最好方法。

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An ambassador comprised of two friends who are unusually empathetic, not two clones, as is the usual means of doing it.

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Today in Google's app store, alleged WhatsApp clones include "Whatsapp Nearby, " "Whatsapp Friends, " and "Whatsapp Add Me" none of which were made by WhatsApp but which allow users to contact each other and make new friends.

WSJ: Clone Wars Roil App World