Hi Simon,
Thanks for answer!
I think the best way to implement would be:
a) a custom field in category page – where you could set up matching Google Product Category
b) in the Facebook plugin setting as optional tab:
– use Google Product Cat for the feed
– then map/match store categories with the Google Product Cat
This way if users could add the Google Product Cat and this way increase the effectiveness of Facebook ads they will use them more often! ??