Arggh, that's too bad. How did you try to load it ? Putting it in iTunes didn't work for me, I had to put it into an app inside my iPad and open it from there.
And yeah, it *****, big time. Especially since I had a 17" quadcore 2.5ghz 16GB macbook pro and these are not sold anymore 😟
I'll try to explain a bit more, but it's hard since I lost the iPad and the computers and I don't really remember the apps name. There is no need to jailbreak your iPad !
You need to install an app which will enable you to browse through the contents of your iPad from your computer, but not from iTunes. I have the impression it was called iFiles, but I can't be sure.
Then, you need to download another app called Installous. And after that, from your computer and the iFiles app, you need to browse through your iPad, find the "downloaded" folder of the Installous app, but your facebook app inside it, open Installous in your iPad, go to the downloaded apps tab, and install it from here.
Sorry I can't be more specific, but it's hard to remember the names. Installous, I'm sure of this one, and iFiles, I'm almost sure but not 100%.
As I said, it's not illegal or anything, and there is absolutely no need to jailbreak your pad.