title: Parse.com PFUser Linking twitter and facebook account?
body: <p>I am using <code>parse.com</code> as backend of my application, it enables the user to login through his facebook or twitter account. Also it has the feature to link twitter/facebook to his pre-existing account. </p>
  
  <p>Here is the problem: </p>
  
  <p>If a user logins through his <code>facebook</code> account a new <code>PFUser</code> is created on the cloud.
  If the same user again logins through his <code>twitter</code> account another <code>PFUser</code> is created on the cloud.
  Now if the user wants to link his <code>facebook</code> account with his <code>twitter</code> account, <code>parse.com</code> replies with "this twitter account is already connected to another user." </p>
  
  <p>How can I merge two <code>PFUsers</code> here? Can anybody please suggest me an approach to solve this issue?</p>