What apps or snippets to use for Facebook and Twitter registration, login and posting?

I am developing a site that I want to link with Facebook and Twitter. 

So as to not reinvent the wheel, I'm looking for apps or snippets that can help with this, specifically:

1) allow users to register and login with their Facebook and/or Twitter accounts.

2) Have these accounts be linked to the local one (crossposting to their FB and Twitter account, pulling in their posts on FB and TW, etc.)

Thanks,

Rodrigo

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