This can be misleading though. This script does get the count you will see on a Facebook 'Like' button which is actually the sum of the 'like','share', and 'comment' counts.

For example, the script gets a count of 1,257,333 for www.apple.com:

https://graph.facebook.com/?ids=http://www.apple.com

Which from here we can see is the sum of the 3 values:

http://api.facebook.com/restserver.php?method=links.getStats...

And by entering www.apple.com as the URL here we can confirm is exactly the figure the Like button shows:

http://developers.facebook.com/docs/reference/plugins/like/

So whilst maybe not 100% accurate in some regards, it is certainly what many people would refer to as the 'like' count (and they'd be confused if you gave a lower number which isn't what the like button on the page showed). This tool is aimed more at URLs than brands.