同一用户的多个Facebook用户ID

Question

I've a problem with facebook login. I've created an app in a facebook developer's account. Next I've used the facebook PHP SDK to make user login and:

• In the PHP SDK response, return this fb id: 884035841685689
• At the following address: https://developers.facebook.com/tools/explorer if I search with this query "me?fields=id" return this fb id: 750153425073932
• At the following address: http://findmyfbid.com/ if I paste the user's facebook link in the textbox it will return this fb id: 100002378440884

I don't understand why with the same user account, return three different facebook id.

Answer 1

User IDs are "App Scoped" nowadays.

• The first one is the App Scoped ID of your own App.
• The second one is the App Scoped ID of the "Graph API Explorer App". Select your own App and you will get the same ID as with the PHP SDK.
• The last one is actually the "real" ID. You only get that one by scraping the user profile, which is not allowed on Facebook.

More information about App Scoped IDs: https://developers.facebook.com/docs/apps/changelog#v2_0