The page custom embed is used for when you want to share few recent post of your page or you want to share it without any javascript involved.

3 Examples

[embedfb https://www.facebook.com/wpemf/ social_plugin="false"]

https://www.facebook.com/BBCCulture/

[embedfb https://www.facebook.com/BBCCulture/ social_plugin="false" posts=2]

https://www.facebook.com/BBCCulture/

[embedfb https://www.facebook.com/BBCCulture/ social_plugin="false" posts=2 theme=elegant]

Sydney Opera House
Landmark & Historical Place
Web Site

[embedfb https://www.facebook.com/sydneyoperahouse/ social_plugin="false" theme=classic]