HTML / HTTP / URL :: QUICK REFERENCE
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FACTUAL REFERENCE

HTML
  HyperText Markup Language. A document markup language used to structure Web
  pages and identify links and other elements.

HTTP
  Hypertext Transfer Protocol. The application protocol used by Web clients and
  servers to request and transfer resources.

URL
  Uniform Resource Locator. An address identifying a resource and the scheme
  used to access it.

None of these concepts require a recommendation feed, an account, or a social
platform. Those are application choices built above the basic Web model.