The Facebook Pixel collects data that helps you track conversions from Facebook ads, optimize ads, build targeted audiences for future ads, and remarket to people who have already taken some kind of action on your website.
You can refer to their instructions here
You should not copy the code block that is provided by Facebook, but instead copy the Facebook Pixel ID that is provided and paste it within the
config.yml file in the following format:
facebook-pixel: <Your Facebook Pixel code>