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So, if you have, when someone imports if on average they send invites to 100 people.
那么假设每个人平均发送100个邀请链接
Sorry doing that wrong, let's say 100 people get an invite per person who imports.
抱歉，错了假设每个人平均邀请了100个人
And then of those 10% click. That gets you to 10.
其中10%的人点击了链接，那么就剩下10个人了
And then, of those, let's say, 50% sign up. That gets you to 5.
然后我们假设有50%的人注册了，还剩下5个人
And then, of those, only 10 to 20% actually, subsequently import.
接着这5个人中的10%到20%会继续导入其联系人
You're gonna be at a point where you're at 0.5 to 1 as your K factor.
结果就是0.5到1个人，那么增殖系数就在0.5到1之间
And you're gonna not be viral.
这就不能称为病毒式传播
So, a lot of things like Viddy are very good at pumping, or were very good at pumping out stories.
视频分享应用Viddy现在，或者说以前对病毒式营销就很在行
They got the k factor over one, and it's perfectly doable to get the k factor over one,
他们的增殖系数大于1让增殖系数达到1以上是完全可以做到的
but if you have something that doesn't have high retention on the back end then it doesn't really matter.
所以如果你的用户存留不高病毒式营销就意义不大
So, you should look at your invite flow and say, what is my equivalent to import?
看看你的整个邀请流程需要导入哪些联系人
How many people, per import, are invites sent to?
每个用户给多少人发邀请呢？
How many of those receive clicks?
多少人会打开链接呢？
How many of those convert to my site? How many of those then import?
多少人会在我的网站注册，多少人会再去导入他们的联系人
To get an idea of your k factor.
据此，就可以算出自己的增殖系数
But the really, important thing is still to think about retention, and not to think about virality.
当然，首先要考虑的还是用户存留而不是病毒营销
And only do this after you have a large number of people retained on your product per person who signs up.
只有当注册的人中很大一部分都能留在你的产品上的时候，再考虑病毒营销
So, couple more things we were gonna touch on.
好，我们还要讲点别的
SEO, email, SMS and push notifications.
搜索引擎优化，电子邮件，短信和推送通知
