Authentication
Documentation for developers on how to log users into your app or website with Facebook Login

CDN
Cloudflare is a web-infrastructure and website-security company, providing content-delivery-network services, DDoS mitigation, Internet security, and distributed domain-name-server services

Advertising
Reddit is a network of communities where people can dive into their interests hobbies and passions There s a community for whatever you re interested in on Reddit

Media servers
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Ecommerce
The World Wide Web Consortium W3C develops standards and guidelines to help everyone build a web based on the principles of accessibility internationalization privacy and security