You will have two choices: XFBML and iFrame. If you use XVBML, it will break the site in Internet Explorer. As a result, take the easy path and use the iFrame code.
Note: If you are using Joomla 1.5, JCE content editor will strip out iFrame code unless you configure it to allow iFrame. You can configure JCE to allow iFrames in the Group settings.
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