If i understand the context in which you ask, you won't find what you have in mind. But perhaps you could look up "Ning" and that just might work for you..
Ive never been to face book but i hear its similar to myspace in the fact its a social place people meet share stuff like pics and what not. If thats what your looking for try http://www.boonex.com/products/dolphin/ its free and has all the features you could ever want.
not quite similar to myspace it is in competition with myspace, however. i do know of a site thats similar, but dont know if there is any script out there www.hatebook.org
If you are looking to set up a social networking website, ie facebook, there is no tool that will create one for you, you would need a script, phpfox is suppose to be quite good, then you need a site designed.
phpfox has to many bugs, burn to much bandwitch agriya.com has a good face book clone back by good people beside the facebook clone u will need marketing money lots of it, i would say a min of 200000
I don't think there is a minimum marketing budget with any site, it all depends on how it grows. Social networking sites practically market themelves through their members.
Well. see exact clone better then studivz and scripts point at http://www.influxive.com/isociety you can contact them at helpdesk at influxive.com these people actually cloned facebook , they are real crazy as i think
Wow, that is a total ripoff. They even left the word "Facebook" on some parts of the site! ("Sign up now to take advantage of all Facebook has to offer." for example)