title: iOS Parse SDK: How to check if login is from Facebook or Twitter?
body: <p>I have an app that allows users to log in to either Facebook or Twitter. There is a single </p>
  
  <pre><code>-(void)logInViewController:(PFLogInViewController )logInController didLogInUser:(PFUser )user
  </code></pre>
  
  <p>method that manages login from the PFLogInViewController. How do I check if user pressed the Facebook login button or the Twitter login button? I have functionality in my app that requires a different setup depending on the log in type. </p>