title: When will the application receive a install_referrer with content utm_source=(not%20set)&utm_medium=(not%20set)?
body: <p>I'm using instll_referrrer tracking the user installation. Recently, I found a lot of user send the refer <code>utm_source=(not%20set)&amp;utm_medium=(not%20set)</code> to my server.</p>
  
  <p>I searched this on Google, and find a artical <a href="https://plus.google.com/+AndroidDevelopers/posts/E54ae9beKLB" rel="noreferrer">https://plus.google.com/+AndroidDevelopers/posts/E54ae9beKLB</a> which tell me this will be set as default for user from deeplinks. And then I searched the definition of deeplink but I don't quite understand it.</p>
  
  <blockquote>
    <p>From now on, if there is no referrer parameter in the URL, a default
    will be set to separate organic installs from deeplinks (i.e. a third
    party referral to your Play Store listing).</p>
  </blockquote>
  
  <p>Dose this means if I received some install_referrer with content <code>content utm_source=(not%20set)&amp;utm_medium=(not%20set)</code>,the user who sent these referrer have installed my app by third party referral which has a format like <code>{scheme}://{host_path}</code> ?</p>