PFFacebookUtils.logInInBackgroundWithReadPermissions(FacebookSettings.readPermissions) {
    (user: PFUser?, error: NSError?) -> Void in
    if let user = user {
        if user.isNew {
            print("User signed up and logged in through Facebook!")
        } else {
            print("User logged in through Facebook!")
        }
    } else {
        print("Uh oh. The user cancelled the Facebook login.")
    }

    self.performSegueWithIdentifier("MainSegue", sender: nil)
}