Odd.. it works for me. anyway, here's the post:
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I found I was able to complete it only using Microsoft IE on windows using the following method:
1. Delete Lightroom from the Apps on your account
2. Re-authorize from Lightroom (make sure Microsoft IE is the default internet browser)
3. When authorizing IE will go to an invalid URL - just copy all of the URL
4. When Lightroom notifies "Failed to receive the authentication token." Click on it to bring up "lightroom://..." under the Facebook Authorization URL
5 Replace "lightroom://..." with the URL you copied and it will be authorized
Note it doesn't seem to work with either Firefox or Google Chrome
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