title: Get users Facebook ID for database
body: <p>I need the following, any help would be much appreciated.</p>
  
  <p>I Have a registration form.</p>
  
  <p>It inputs the data Name | ID | DOB | TWITTER | FBID</p>
  
  <p>When the user registers it asks for the above values. 
  Twitter is easy as users can just put in their Twitter ID.
  But I Need to get the users Facebook ID in the form.</p>
  
  <p>What would be the best way to do this?
  Could i use the 'Connect To Facebook" Feature.
  All i need is the Facebook user ID so that i can use it when retiring graph data later on.</p>
  
  <p>I have set up a Facebook Application and am using PHP with a MySQL database.</p>
  
  <p>Thanks
  Alex </p>