Comment Option is a feature that allows you to send a private message based on the comment a user creates on any post on your page; by just selecting the post and keywords to match.
HOW TO CREATE A COMMENT OPTION
Go to Connect on the side menu and click on “Messenger Icon”. When the side menu expands, select “Acquire users from Comments”.If you don’t have any previous Autoresponder created, you will see this page.Now click on Create an Autoresponder.Enter the Keywords on which you want to send messages to users who use them in the comments. Select a Post on which the user's comment matches the keyword. Type the Message which you want to send to the user. Click Save.Congratulations, you are done. Now when a user comments they will immediately receive the message that you have set up.