Is Facebook generating new webpage for every user accounts or they just using 1 webpage for every account?

What actually happen if NEW USER creates an account in Facebook? does the Facebook generate a new Web Page for it? or They just have 1 Web Page for all user account and all of them are accessing the page when they are online? I am new in web development and i want to know if how Facebook actually handling the process when the user created an account. I want to know if every user has they own Web Page generated by the server side scrip. and saved on the server and access it when they are online, or there is only one web page on the server and all of the user are accessing this page when they are online?