The issue has been successfully resolved by the Facebook team. The shops are displayed on the Facebook pages.
Oct 12, 02:47 UTC
Facebook has identified the source of the issue and are currently working on the fix. We will continue posting updates here and notify you as soon as the issue is fixed.
Oct 11, 18:04 UTC
This status concerns only those merchants, who exported their products to a Facebook business page.
At the moment Facebook is experiencing some technical problems. Your store may not be displayed on your Facebook page. This affects all the Facebook shops, not only Ecwid. We are monitoring the problem and will keep posting updates here.
Note, that the issue affects only Facebook shops. Your store information is safe and intact and your store is available at your Starter Sites/websites where you added Ecwid.
Oct 11, 10:33 UTC