What are the open source alternatives for Facebook? [closed]

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Just want to look at how things are implemented for learning purpose and may even contribute something along the way. So is there any open source facebook clones out there ?

Thanks

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Searching gives

1. Diaspora
2. OneSocialWeb

as starting points, a list of active distributed social media sites can be found here

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This one is most polished right now: http://elgg.org/

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Not exactly a 'clone' but Diaspora is an open source, decentralised, distributed alternative to Facebook.

https://github.com/diaspora/diaspora https://joindiaspora.com/