To create this trigger, first navigate to the “Triggers” tab and then scroll down to find the “Start a flow when Facebook refers a contact” option:
![](https://storage.crisp.chat/users/helpdesk/website/4255307b31f6b000/4877fabf-1c9d-48be-9024-2b8f57_itjp6p.png)
Next, choose the channel you want this trigger to operate on and the flow you want to start:
![](https://storage.crisp.chat/users/helpdesk/website/548afeed93373800/0eb10f4b-783e-48b7-bf7d-f8e9c1_tqh7vr.png)
Note that the referrer ID is optional. It can be embedded in a link to be customized with the flow you use. For more information on referrals see here.
Once you’ve created this trigger, the flow will be started when a contact initiates a conversation with Facebook Messenger on your page.
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