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"After Joanna Shields announced at LeWeb that Facebook would deliver a new social plugin for websites that would allow Facebook users to subscribe to user updates on websites, the company has made it available for developers and website users to utilise.\r\n\r\nThe Subscribe button for websites is very similar to Twitter's Follow button and operates the same way as it does on Facebook's own website. If a website has embedded the button and a user clicks, they will instantly begin receiving updates from that brand or person in their News Feed.\r\n\r\nFacebook has also incorporated it into the shared stories, meaning that if a new post is shared in your stream, they will be able to subscribe directly via that News Feed story, increasing the virality of the post across Facebook.\r\n\r\n\r\n\r\nTo embed the button, website owners have three options; a XFBML code snippet (one using Facebook's own markup and another that is HTML5 compliant) and an iFrame.\r\n\r\nTo embed a Subscribe button on your website, hit the Subscribe Button widget page to generate your own.\r\n\r\nThe Subscribe button has been\u00A0embedded\u00A0on a number of websites already, including Absolute Radio, AllThingsD, ANSA.it, The Daily Beast/Newsweek, Forbes.com, \u200BGQ Italia, The Huffington Post, Mashable, Ministry of Sound, msnbc.com, NME.Com, TechCrunch, TIME.com, TODAY.com, and washingtonpost.com.\r\n\r\nWith Twitter delivering a huge update today, the battle to generate interactions on the two services has gone up another few notches."^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/facebook/2011/12/08/facebook-rolls-out-its-new-subscribe-button-for-websites/>