I'm using Facebook Social Plugin on my website. But I don't know who came to my website and liked my individual pages. If you take a look at my pages, you can see a person has liked it but who?
Unless something's changed since this follow-up post to their social graph announcement, you can't. Except for people who are your FB friends. There's a lot of information, but you're primarily interested in these sections:
- What information about me does Facebook share with the websites hosting social plugins?, and
- Will people beyond my friends see what I like or recommend?
You can use the social graph API to fetch the last 500 fans to like a page.
You can also gradually scrape the data by repeatedly refreshing the social plugin and recording unique user IDs.