Install a Facebook Pixel on Your Store.
Facebook pixel gives you powerful insights into how visitors from Facebook interact with your site. The pixel is an incredibly useful and free tool for marketers.
When someone takes an action on your website after clicking on an ad, your Facebook pixel records it as an event. Facebook can track 9 of them:
View content - Track key page views (article, landing page, product page)
Search - Track searches on your website (product searches)
Add to cart - Track when items are added to cart
Add to wish list - Track when items are added to wish list
Initiate checkout - Track when people enter your checkout flow
Add payment info - Track when people add payment information during the checkout flow
Make purchase - Track purchases or checkout flow completions (landing on purchase confirmation page)
Lead - Track when someone becomes a lead (form submission, sign up for trial)
Complete registration - Track when someone completes a registration form (complete subscription, sign up for a service)
Optimization
Your Facebook pixel helps you bid specifically for conversions on Facebook. After collecting enough Facebook lead and customer data, Facebook will only show your ads to users who are most likely to convert or buy something from your website.
Remarketing
You can set up remarketing campaigns to past customers who’ve converted through a Facebook ad or users who have visited your website or certain web pages by clicking through one of your Facebook ads.
Audiences
Once your pixel tracks a minimum of 100 conversions, you can create a lookalike audience of your website visitors and past customers on Facebook and advertise to them.