Allowing multiple domains for 1 Facebook App (like Tumblr)

Question

I am trying to get my website validated with the Facebook object debugger and I\'m running into the following error:

Object at URL \'http://www.exampl

Answer 1

How can a facebook app be configured to allow being used on multiple domains?

It can’t. Facebook apps are tied to one domain (and subdomains thereof).

Imagine what would happen otherwise – someone could add lots of (big) websites to one single app, and then f.e. embed the JS SDK on each of them, and recognize a user that is connected to that app over “half the internet” … and thereby track their (almost) every step.

Facebook of course does not want this¹ – because they want to make money of the data they collect about users and their movements through the web (they can in theory track you on every single website that uses a simple like button) – they would be stupid if they gave that same ability to every app developer.

¹ OK, that’s my own assumption.