FB Comments allows Facebook users to comment DJ-Catalog2 products.

This plugin comes free with the subscription of the extension.
You'll find it installed (you may need to enable it manually) after extension's installation, alternatively it's available in downloads section (available for active subscribers).

To enable DJ-Catalog2 Facebook comments open Components -> DJ-Catalog2 ->Options

Choose General settings tab and go to "Social sharing & commenting"

fb comments 

Short description:

Comments - Select comments type in advert view

Import Facebook SDK -  Required by FB Comments, you can disable it if your website imports API in other way

Let's see the example DJ-Catalog2 product with enabled FB Comments plugin:

fb comments2