Good CMS for making a community or social network?

Hi all

What is a good CMS that is like facebook that I can download and use to make a community similar to that of facebook.

I need anything ranging from open-source to commercial.

Thank you in advance………………..

Elgg is probably the closest fit: http://elgg.org/

there’s also http://www.pligg.com/

Guys.

Those were quick answers. Thanks. I have seen the 2, am going looking into them now.

But, am not stopping the topic, keep more coming.

Thanks. Modx Network really works!!!!!!!!!!!

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