URL Links with functions
From Facebook Developer Wiki (FbDevWiki.com)
Redirect URLs with special functions
Add a friend
http://www.facebook.com/addfriend.php?id=FRIEND_ID
Send Message to a friend
http://www.facebook.com/message.php?id=FRIEND_ID&subject=XXXXX&msg=XXXXX
Add App to Page
<a target="_blank" href="http://facebook.com/add.php?api_key=YOUR_APP_KEY&pages=1&page=YOUR_PAGE_ID">PAGE NAME</a><br/>
Goto Page Selection Page (If user authorized "manage_pages", he can select a page on this site, where he wants to install the application on)
http://www.facebook.com/add.php?api_key=YOUR_APP_KEY&pages
Send Message
http://facebook.com/?compose&subject=[SUBJECT]&message=[MESSAGE]&id=[FBIDOFRECIPIENT]&sk=messages
Feed Dialog
http://www.facebook.com/dialog/feed? app_id=123050457758183& link=http://developers.facebook.com/docs/reference/dialogs/& picture=http://fbrell.com/f8.jpg& name=Facebook%20Dialogs& caption=Reference%20Documentation& description=Dialogs%20provide%20a%20simple,%20consistent%20interface%20for%20applications%20to%20interact%20with%20users.& message=Facebook%20Dialogs%20are%20so%20easy!& redirect_uri=http://www.example.com/response
URLs information in XML
Stats URL
http://api.facebook.com/restserver.php?method=links.getStats&urls=http://www.facebook.com