To create facebook comment app api Key, kindly follow the steps below.
Step1: Login to facebook
Step2: Visit the link https://developers.facebook.com/docs/plugins/comments/ and click on “Create App” in the top right corner.
Step3: A pop-up will display to fill in your “Display Name” and “Contact Email” provide the information and click on “Create App ID”.
Step4: Copy the App ID in a notepad.
Step5: Visit the link
https://developers.facebook.com/docs/plugins/comments/#configurator
Step 6: In the link, provide the information such as “Site url” where the comment system will be enabled and also the number of post to be displayed such as 5,6 etc and rest will be available by pagination.
Step 7: Login to site administrator, Go to JomClassifieds -> Global Configuration -> Site display settings -> facebook Comments -> facebook app id (Paste the facebook app id) -> Save.
Step7: You can choose the number of post you would like to display in first page and also the color scheme for the comments and save.
Step8: The comments will be displayed in advert detail view as the image below.