In August Apple had added the sharing capability on the Mac Pro and iPod Classic pages. Now Apple has added the feature across the entire online store.
Now you can share the links of the products from the online store on your Facebook or Twitter accounts. The links are located in a drop-down arrow on the right of "Add to Cart" links on the store.
Choosing to share a link on Twitter opens a window pre-populated with the name of the product and a link to the Apple online store. For Facebook, a window opens and users can post a thumbnail and a link to the product via their account.
Via | AppleInsider