Overview
Formerly known as Facebook Pixel, can be used to collect data that helps you track conversions from ads, optimize ads, build targeted audiences for future ads, and remarket to people who have already taken some kind of action on your website.
How
Go to the Admin menu and select "Integrations & Addons"
Find the Meta Pixel card.
Click the "Get Started" button.
Enable the feature and then enter in your Meta Pixel ID.
Hit the "Save Settings" button when finished.
For more information about the Meta Pixel, learn more here.