Yes of course. Most websites are scripted and thus the source is generated. Facebook doesn't have a literal profile page for every user. It has one page called 'profile.php' which generates the source depending on why a user is visiting the page, and the perameters given to it (such as whether the user is a friend, whose profile it is, etc.). The same goes for almost every web application, mahalo and wikipedia included.
Source(s):
Web programmer - it's my job to know these things ;)

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