In the Joomla administrator write down inside an article, module or script the text [ fbpage = https://www.facebook.com/DoctorWho?fref=ts ] (without spaces) and, voila, you have a Facebook page activity embedded on your Joomla website. I hope you are a Doctor Who fan.
In the administrator section you can edit this string - you can change its name and the CSS code attached. Using the CSS code you can set the width and height of the embedded Facebook page, the position and other attributes (like the margins). Also, you can configure the Facebook plugins and set other information as application ID, color scheme, moderators (as Facebook users IDs), and others.
