metric drop 怎么debug

上次给大家分享了一个 怎么提高 facebook engagement rate 的product题 ：
还有 FB - Should we add a love button?  new feature的题目：
求到一些大米 还是不够看面筋 继续来分享 这是是metric drop 怎么处理

Facebooks’ user engagement drops by x%, what would you do?

父老乡亲 请加大米啊 小的 穷的什么也干不了 目标是筹集15个大米 给别人加大米 你不用用自己的大米 真的  

思路：

Whenever they ask about why a metric is down, start by breaking it down into its components and analyze them independently.
Very often in these questions they give you year over year metrics (i.e. this year divided by previous year) and the metric itself is a proportion. The goal of this from their perspective is to see how you, step by step, break it down into numerator and denominator.

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and say users increased there for a local marketing campaign or decreased because of a local competitor launch. It just makes easier to clearly define and delimitate the problem.

But you could certainly also say that actually number of likes went down and then explain how you would discover the reason. If a number related to an action on the site suddenly goes down, the most likely reason is a bug.  BUG REPORT?LOADING TIME?BAD UI? DATA PROBLEM?

非常有用 谢谢分享！

谢谢楼主的分享!