there is already a facebook link on the top right corner of every listing

Sorry I should have been clearer.

I am wanting to drive people from eBay to my FB page not share eBay listings on my FB page.

Sorry, putting a link, or even having a reference, to social networking sites is currently not allowed. 

Of-course, eBay will not allow you to link somewhere from where you can sell that item (or other items) without paying eBay fees.

Thanks guys.

I thought as much but I saw something on someones listings so thought it was worth an ask 🙂