Hello there
I have seen your requirement , provided link and attached jpeg file carefully and I can surely Add facebook share button in custom generated product image popup efficiently according to your need and provide you best work.
I am a over 5 year experienced designer and developer.
I am having expertise in Prestashop, E commerce, shopping cart.
I am ready to start work on your project right NOW.
For more detail message me in PMB.
Regards,
Neha