Merge pull request #255 from danielskatz/patch-3

adding brief discussion about impact

Author: Nadia Eghbal

_articles/metrics.md

@@ -22,6 +22,7 @@ With more information, you can:
 * Figure out where new users come from
 * Identify, and decide whether to support, an outlier use case or functionality
 * Quantify your project's popularity
+* Understand how your project is used
 * Raise money through sponsorships and grants
 
 For example, [Homebrew](https://github.com/Homebrew/brew/blob/bbed7246bc5c5b7acb8c1d427d10b43e090dfd39/docs/Analytics.md) finds that Google Analytics helps them prioritize work:
@@ -73,6 +74,8 @@ For example, if your project lands on the front page of Hacker News, you'll prob
 
 Try to figure out where your audience is coming from and ask others for feedback on your project page to figure out which of these two issues you're facing.
 
+Once you know that people are using your project, you might want to try to figure out what they are doing with it. Are they building on it by forking your code and adding features? Are they using it for science or business?
+
 ## Retention
 
 People are finding your project and they're using it. The next question you'll want to ask yourself is: _are people contributing back to this project?_