OAuth for Twitter an Facebook connect

I'm creating a multi-platform (web, iOS and Android) game with Unity. This game may have the ability to post the user score to Twitter and Facebook. There's libs to that for iPhone and Android isolated, but I would like to know if there's any multi-platform integration for this process, maybe a way to do the OAuth authentication directly from an Unity component, with no external library.

Any ideas?

UniShare requires Unity Pro.

Checkout this

http://dimerocker.com/dimerocker-arcade/

(I assume it is cross-platform)

http://u3d.as/content/young-wook-yang/let-s-tweet-in-unity/1Dq

http://u3d.as/content/social-play/face-book-net-integration/1tT

I haven't tested any of these though!

UniShare just fit your requirement, it’s a sharekit for unity3d, both iOS, Android support, include twitter, facebook, linkedin, etc.
Check out here