How do I create a message greeting for my Page?
You can create a customized greeting from your Page that will appear in Facebook chat and in the Messenger app for iPhone, iPad and Android when someone begins a conversation with your Page for the first time. Your Page's greeting will appear before any messages are sent.
To create a Messenger greeting:
  1. Click Settings at the top of your Page
  2. Click Messaging in the left column
  3. Below Show a Messenger Greeting, click to select Yes
  4. Click Change, edit the greeting, then click Save
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