I was just browsing through facebook profiles and some other social networking sites like twitter and I realized that each profile has its own URL. However it is a simple URL and not a complicated one (e.g. facebook.com/john.doe). My question is how is this possible to develop? Is a folder created for each user with the name and surname of the user and an index.html put in the folder? Or is a new page created in the root folder and the extension is hidden?

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