Well, I just created a new website for the P2 Forum, gave it a sub-domain and then created a menu in my main website to link to the new sub-domain(which is for the P2 forum website).
I have also installed a particular plugin that allows the admin and other users (author, contributor, editor, etc.) to share their posts to everyone. It's fine.
But my issue now has to do with "subscribers". For now I see that before a subscriber can post a New Comment, he/she has to register with WordPress only. (For commenting on an old post, a subscriber has to provide just a name and email and then comment)
I REALLY WANT SUBSCRIBERS TO BE ABLE TO REGISTER WITH their Facebook, Twitter, WordPress, Google, Yahoo or whichever medium they want to use and not just WordPress. So they can also post NEW COMMENTS