facebook product sharing :
we should be able to share products on our facebook page like a normal post using mag manager.
facebook store addon :
We should be able to use store manager to sell products through facebook or at least redirection through posting to our webstore. Main benefit is we already have product data in store manager to be able to share/post by single click as well as can make invoice directly using mag manager's POS.
In short FB --> Mag Manager --> webstore sync.