Facebook - Detect if user has liked your page?

Is there any way to detect if a user has li开发者_如何转开发ked X page outside of facebook?

So say my URL is:

http://www.site.com/page.html

My facebook page is:

http://www.facebook.com/myfacebookpage

Is there any way to detect if the user visiting my web page has liked my facebook page? and show text if they have or haven't liked it?

The only way to do this is if the user has authenticated with your application and has granted user_likes extended permission. Then you could call /me/likes.