Using Iframes on your sites won´t get you in trouble with DC, however, if you put the same content in the different Iframes, you could get into trouble regarding the DC.

You use duplicated content to get traffics. But if you use IFRAME, search engine can not read your contents and you gain nothing. Your contents won't be searched.

In my opinion there is only one solution: Quality, unique content. Don't try to cheat the search engines, this will only hurt your site.

Since the latest Panda update, Google penalizes sites (the entire site and not just pages) that have a certain amount of duplicate content pages.

Hi interesting topic

I have just created an iframes clone of my site which is only for within my facebook page. Will this mean I have duplicate content issues?

yes you can, but whats the use of using i frame if its not crawlable by search engines spider ?