Facebook follows 301 redirects to the real url so using link shortener services won't work.Use a javascript based redirect or a landing page.
yep im using it but still it has some problem , they ban the page in the middle that redirect to the main page , even if they dont catch ur end pointYou can check this thread http://www.blackhatworld.com/seo/trick-post-blocked-url-on-facebook-for-newbies.842496/