Brand Pages Can Communicate
Did you know that Facebook Messenger isn't just for fast, convenient notes between people on Facebook? Brand Pages can now communicate with customers, visitors, and guests via private messages, including responding to a Page comment with a message. It's a great way to answer questions quickly and solve problems.
You can even automatically earn a special badge for your Page if you respond to 90% of messageswithin five minutes.
Obviously, you need to decide if you're ready to meet the expectations of this sort of customer service. People WILL expect a response from your Page, just like they expect a response and interaction when they leave a comment.
To turn on Page messaging, you must be a Page Admin. Then, do the following:
Go to Settings - General - Messages - Allow people to contact my Page privately by showing the Message button - Save Changes.