old_contents: from django.db import models
  
  class FacebookProfileModel(models.Model):
      '''
      Abstract class to add to your profile model.
      
      NOTE: If you don't use this this abstract class, make sure you copy/paste
      the fields in.
      '''
      about_me = models.TextField(blank=True, null=True)
      facebook_id = models.IntegerField(blank=True, null=True)
      facebook_name = models.CharField(max_length=255, blank=True, null=True)
      facebook_profile_url = models.TextField(blank=True, null=True)
      website_url = models.TextField(blank=True, null=True)
      blog_url = models.TextField(blank=True, null=True)
      image = models.ImageField(blank=True, null=True, upload_to='profile_images')
      date_of_birth = models.DateField(blank=True, null=True)
      
      class Meta:
          abstract = True
new_contents: from django.db import models
  from django.contrib.auth.models import User
  
  class FacebookProfileModel(models.Model):
      '''
      Abstract class to add to your profile model.
      
      NOTE: If you don't use this this abstract class, make sure you copy/paste
      the fields in.
      '''
      user = models.OneToOneField(User)
      about_me = models.TextField(blank=True, null=True)
      facebook_id = models.IntegerField(blank=True, null=True)
      facebook_name = models.CharField(max_length=255, blank=True, null=True)
      facebook_profile_url = models.TextField(blank=True, null=True)
      website_url = models.TextField(blank=True, null=True)
      blog_url = models.TextField(blank=True, null=True)
      image = models.ImageField(blank=True, null=True, upload_to='profile_images')
      date_of_birth = models.DateField(blank=True, null=True)
  
      def __unicode__(self):
         return self.user.__unicode__()
      
      class Meta:
          abstract = True
  
subject: Add reference to user model and __unicode__() method to FacebookProfileModel