How do I make my website like facebook?

[Maxine]

Have all that chat stuff, and have my user login in their account and post things, and

[Christian Najera]

Hm,
Well I'm sorry to say that if you copy Facebook's design, you can be sued for copyright violations. They have their content protected by law.

[HimanshuMehani]

For making a website you need to know HTML,CSS, JavaScript, php. I am assuming you don't know all this, so I suggest you to learn all this first.
Building a social networking website won't infringe Facebook's copyrights.

[cashcashjonny]

Employ a programmer / web designer