What I found useful and I found on one link above is this FQL query where you ask for likes, total, share and click count of one link by looking at the link_stat table
https://graph.facebook.com/fql?q=SELECT%20like_count,%20total_count,%20share_count,%20click_count,%20comment_count%20FROM%20link_stat%20WHERE%20url%20=%20%22http://google.com%22
That will output something like this:
{
data: [
{
like_count: 3440162,
total_count: 13226503,
share_count: 7732740,
click_count: 265614,
comment_count: 2053601
}
]
}