From README.txt:
Upload facebook-php-sdk (http://github.com/facebook/php-sdk/) into fbconnect module folder (or into libraries folder, if you want to use it with the libraries module)
(What is the "libraries module"?)
I got alpha2 working from the /sites/all/libraries folder, but not alpha3. Had to move facebook-php-sdk to the /sites/all/modules/fbconnect folder.
Closed: duplicate
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