Nice. Installed it on vB 4.1.10 and it's working!
Thanks for all your help, especially to Replicators.

Do you know what would be really great, if comments on Facebook we're posted as individual posts within a thread.

I share a lot of my threads on facebook and often people comment on Facebook rather than my site. I dream for comments being intergrated properly within a thread so it just looks like part of a thread.

Thanks for this, installed, think I get it right, once I figure it out I'll give you some support mate, great stuff!!!

Where does one find the xd_receive.htm file and what exactly is it supposed to do?

All I see when I click your link (from above)

QUOTE
What is needed for this modification:
•A standard facebook account.
•A facebook application, anyone can set one up and it's simple http://www.facebook.com/developers/createapp.php
UNQUOTE

is "Apps" and to the right of that, a button that says "Create New App"

Nothing happens when I click on the "Apps".

I don't get it.....

Please, can someone tell me how to get this modification?? When I click the link it goes to facebook but it doesn't show any apps to upload.

Oh, wait, I think I got it.

Where is the "SHOWTHREAD TEMPLATE"?

Is it this???:

Customize Template: showthread-ie.css

I went into Admincp -> Styles & Templates -> Search in Templates -> in the "Search for Text" box I put "showthread")

Then what appears is a long list. There is a "CSS Templates" with two items beneath it ("showthread-ie.css" and "showthread.css") If I click on each of them I am taken to a different box with code in it. Which one do I choose?

I don't see this "{vb:raw similarthreads}" in either of them, though. So does that mean it is neither of them?