Previously I was using FQL for this, but this is deprecated as of v2.1 and I\'m moving over to v2.3 using the graph edge \"likes\".
Here is my URL:
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Anyone stumbling onto this answer now (April 2016) will get frustrated because the accepted answer no longer works in v2.6
?fields=likes and /likes now return the same result -> the pages that the page likes.
To get the number of fans, you now need to use fields=fan_count
https://graph.facebook.com/pepsius/?fields=fan_count&access_token=
As you can see above, you can also make the request directly with the pagename, no need to fetch the pageID.