Websites that have a shopping cart or checkout page, either using a known ecommerce platform or a custom solution.
Clutch review widgets are stand-alone applications that you can embed on your website to show your dynamic ratings and reviews.
Facebook pixel is an analytics tool that allows you to measure the effectiveness of your advertising.
Google Analytics is a free web analytics service that tracks and reports website traffic.
Open Graph is a protocol that is used to integrate any web page into the social graph.