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Facebook April 21 unveiled a Facebook Platform redesigned to let Website publishers build a bridge between their content and users’ Facebook information.

The new Facebook Platform, which CEO Mark Zuckerberg and other executives unveiled at the company’s F8 developer’s conference in San Francisco April 21, supports Social Plugins.

These plug-ins require only one line of HTML or XFBML (Facebook markup language) tags to let publishers port Facebook’s social graph to their Website.

The plug-ins include the widely reported-on Like button, which lets users share Website content they enjoyed.