Have you ever wondered how some Facebook pages show specific content or offers only to fans? If so, look no further.
(Important Update: Facebook no longer supports FBML. Please refer to the articles on Facebook iFrame.) One of the most popular FBML tags is fb:visible-to-connection. A favorite of marketers, this FBML tag allows a Facebook page to show different content to fans and non-fans. When a non-fan clicks the Like button - viola! -