I am not a great author, and won't let u read long preface and prologue. Lets directly get into what you are searching for.
The keyboard shortcut for Facebook (in Windows) are:
Alt+?: Search
Alt+m: Compose a new message
Alt+1: Home page
Alt+Home: Home Page
Alt+2: Your profile page
Alt+3: Friend requests
Alt+4: Your messages
Alt+5: Notifications
Alt+6: Account page
Alt+7: Privacy
Alt+8: Facebook's Facebook page
Alt+9: Facebook Terms/Agreement
Alt+0: Facebook help center
These shortcuts works best in Google Chrome.
In Internet Explorer, you will need to hit Enter key after each key combination.
In Firefox, you will need to add shift key to the above combination, i.e Shift+Alt+? for invoking the Search.
These are what I have discovered yet. U can still try other Function key combination to discover other shortcuts as well.
