Online storefront as a Facebook tab
A few weeks ago Facebook developers introduced the ability to embed iframe applications (e.g., online storefronts) as tabs in user accounts next to “Wall”, “Photo”, “Discussions”, etc. This new feature allows shoppers to proceed to the storefront without leaving the online store’s main Facebook page. Before the feature was added, online storefront opened as an ordinary application, i.e. still within Facebook but outside of the store’s main account page.
In order to embed your storefront as a tab on your online store’s main Facebook page, follow our detailed instructions (see section “Main Facebook page of your online store”).
To see the difference, look how an online storefront was embedded in Facebook before:

… and how it can be embedded now using this great new feature:

By the way, owners of WebAsyst Shop-Script based shopping carts have already begun to embed their storefronts as Facebook tabs; e.g., http://www.facebook.com/MegaPodarki