what i'm missing without Oauth in Drupal 7?

hi,

I'm in the typical moment in which I have to decide to start a new project using Drupal 7 or Drupal 6.

I'm mostly interested to use Services; I installed Services version 7.x-3.0-rc3 and see that Oauth authentication requires module Oauth, but, as far as I see, there is no version for Drupal 7 (http://drupal.org/project/oauth)

I understand that Oauth is for user authentification, but I'm not sure what exactly I'm missing if I really cannot install it in Drupal 7 (i'm afraid i cannot user Facebook and twitter login)

thanks in advance,
Pere