Add facebook "Like us" button to campaign hml email template?

Hi.

I am trying to add the standard Facebook and twitter buttons to our standard company newsletter that we have been sending through constant contact in the past.

These buttons typically require a "widget" like script/module generated by facebook for inclusion in a newsletter or website.

here is the example:
https://developers.facebook.com/docs/reference/plugins/like-box/

When I try to add "html" to either a simple template or to a full html template, the code provided by facebook does nothing and the script part gets removed on saving.

How do I accomplish this in Zoho Campaign?
Is there a way to generate some Zoho compliant "widget" or code that can be included in a ZohoCampaign email?
Is this generically impossible?
If my customer requires emails to include "social promotion links" is this a dealbreaker for ZohoCampaign?

Please don't refer me to the Social Campaign functions of ZohoCampaign. I understand these, I think, and they seem to be responsible for social postings on external websites like Facebook. I am specifically looking for a way to do this promotional campaign emails.

Thankyou so much, in advance, for responding with any ideas.

Jack Spivak