title: Do I need to add new key hash to Facebook app setting every time I change computer?
body: <p>I download Hackbook example from git then, I create and run project. It show that <strong>Login failed: invalid_key</strong>(I didn't change anything) So, I try create my new own app and add Hash key that i got from keytool to facebook app setting (Android Native App) Then, I change this <code>new Facebook("My_own_APP_ID");</code>  It works!  </p>
  
  <p>The question:</p>
  
  <ol>
  <li>Do I need to add new key hash every time I change development computer(In case, there are many collaborators, Do they need to change Facebook_APP_ID everytime ?</li>
  <li>In case, I wanna launch this app to market. Do I need to change this <code>keytool -exportcert -alias androiddebugkey -keystore ~/.android/debug.keystore | openssl sha1 -binary | openssl base64</code>  when i ask for hash key ?</li>
  </ol>