title: How does facebook mobile web-url for tabs work?
body: <p>I want to be able to share an url on my facebook-page that refers to a page-tab, and have that user redirected to an external site if they are on a mobile.</p>
  
  <p>In the settings for a facebook-app there is a field called mobile web. The explanation says "The Url for your mobile web app that facebook will be dierected to  from facebook." Perfect this is what I want.</p>
  
  <p>My app is in sandbox–mode I have added an extrenal url like this: <a href="https://myapp.herokuapp.com/" rel="nofollow">https://myapp.herokuapp.com/</a></p>
  
  <p>It's the same as the one I use for my page-tab.</p>
  
  <p>I went to the tab on Facebook and copy+paste that url so and can post it as my page</p>
  
  <p>The url looks like this (but with other numbers):
  <a href="http://www.facebook.com/pages/Testelitest/12039123?id=12039123&amp;sk=app_1029381092381" rel="nofollow">http://www.facebook.com/pages/Testelitest/12039123?id=12039123&amp;sk=app_1029381092381</a></p>
  
  <p>If I click the link on a computer, I come to the page-tab. If I click the link on a mobile device I come to the page that posted the url. I expect to come to the external site.</p>