Adding Facebook content to popup

I'm trying to create a popup which includes the Facebook page plugin to encourage users to like our Facebook page.

https://developers.facebook.com/docs/plugins/page-plugin

Only problem is, if I paste the Javascript that Facebook suggests into the Main PopUp Content, the popup no longer loads.

Is there a resolution for this?

It would also be great if adding things like Follow us on Facebook/Twitter as default popups could be added as I'm sure a huge amount of people would like this as a standard feature.