title: If I claim Facebook page usernames do they auto redirect from old URL?
body: <p>My Facebook page currently has the URL <a href="https://www.facebook.com/pages/sitenamecom/129112207588" rel="nofollow">https://www.facebook.com/pages/sitenamecom/129112207588</a>. 
  I want to claim my username so it will become <a href="https://www.facebook.com/sitename" rel="nofollow">https://www.facebook.com/sitename</a>.
  My question is do existing links to the old URL automatically redirect to the new one. I have links in a lot of places and will change over time but in case I miss some will they automatically go to the new page URL or will there be an error. </p>