Go to Integrations > Facebook.
Click on 'Connect Facebook Account' button.
Next, you’ll be asked to grant Customer.io Audience Sync access to Manage your Adwords Campaigns. This access will allow the sync to occur.
Once you’ve allowed access, you’re done!
Once Facebook account connected, Select the Ad account, click on next button.
Click on "Create Audience" button.
Specify name of the audience, we suggest adding " - Growlytics Synced" at the end of audience name to keep audiences organized in the Facebook Ad Network.
Add description for the audience and click on create audience.
You're done! You've successfully created a Facebook audience which is hourly synced with Growlytics.
Go to segment list page, select a segment to open segment detail page.
On segment detail page, click on "Ad Audiences" tab.
Select the channel you want to sync.