Ning like open source alternatives [closed]

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I have to make something like Ning ( a website where users 开发者_开发技巧can create their own sites/networks) .

Another example would be webs.com

Are there any Open Source alternatives (PHP only) to these ?

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Wall from Indian Srinivas Tamada it's not full open source, you must pay to buy the script, but after you buy you have the script and database, all open. If you want study, maybe it's a good way, but have some bugs, I bought one.

http://wall.9lessons.info/

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Try GROU.PS - http://grou.ps