there are a few different types here.
scriptcopy.com/facebook-clone-script/
but maybe you are looking for open source.

Yes open source please? I already mention this is my question!

Why do you need this ? Unless you have many new ideas to add to facebook, I don't think you'll be successful . People won't use a new similar website when facebook is already there, you have to make something much better if you want to be successful

programmerscott you're right but I want to build a site like that for local use in a single niche for local (my city) professionals! so I think it'll be batter? isn't

I agree with programmerscott . They can just create a page on facebook . I don't get It how your site is going to make a better network for them than facebook . Facebook is like a god in Social Networking

actually I don't have any idea about it.
I'm also looking for this type of solution.
coz I have a dream to create a social networking site.

Come on people, have some creativity . You are just copying ! I am 100% sure that at least 1000 other people tried to copy facebook, but none of them were successful . You must have something to be different from the others

Yep .. dont copy a site .. improve one .. FB did improve MySpace .. by making the persons profile / (now timeline) .. nice and clean instead of all crazy like myspace was. They also added the 'like' feature .. one of the most successful things ever.. and the 'wall'

try googling it

For example, today FACE BOOK did ban me. They do not like me. Having your own site gives you more control and power. Also, there are other reasons. BTW, more power to you.

If you're using Wordpress there is a plugin called Wp Book, and it can turn your blog (wordpress installation) into a facebook-like platform.

@sonia: who knows this man can create a website way better than facebook

Research and practice will help you to get an idea.

Check this videos:
https://www.google.com/search?q=over...w=1152&bih=775

Don't dream to create a site like facebook. Make something different not like facebook..

best script for this is phpfox

you can download this from
phpfoxcamp

If you're expecting a lot of traffic, you're going to need a heavy-duty server to give anything like the performance that people expect from Facebook and the like.

As you said you were looking for open source, I'm guessing your budget is limited. I would personally look at creating a prviate group on Facebook or LinkedIn.

The other advantage to that is that many people already have an account on those platforms and it's MUCH easier to get people to stay within an existing site than to get them to sign up on a new site.

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Well by Facebook we all mean a Social Network so why would be go for something like Facebook, make something that suits your idea. Businesses now shifting to social media i know some big hospital chains that has built their social network for doctors, but it is not at all like Facebook neither it should be. If warrior wants to build a social media platform i can help in this regard, an affordable solution anyone who is interested can hit me up at Skype adnan.ahmed227.

You should go the custom route...Other scripts may have buggy issues..

Do you try com compete with FB ?

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Which platform you wanna use?
php or .net?
My suggestion php,please get more training and try to establish your idea.

There are so many websites that can provide you free of cost domain to create social networking site. Some of them may be provide you account for a limited period only. All the best for your website.

Take a look here : Facebook Clone Script

Why don't You just google "facebook clone" or "facebook clone script" ? It generates many results, I'm sure at least one of them will prove useful