Best Social Comment for my Wordpress website

I need a social comment that has facebook, google+, twitter, linkedin so that customer can use that to login. The social comments must be working 100% across all browsers. I also have a login feature for my website, so they can login through there too. 1. Suppose if the user is a registered site user. Then it will display siteuser name, and image. 2. Users can submit comments to the site. 3. Suppose if the user browses the site without loggin in... 4. The user can connect with the facebook, twitter etc.. 5. Suppose the user clicks on the facebook icon. [login to view URL] code will connect with facebook and a. If the user already logged into Facebook in another window... he needs to just click Allow to be able to display his information with our site. (thumbnail image and his name) b. If he is not logged in.. then he can login thru facebook.. which will display his thumbnail and name in our site. I need it done in 2 days. Highest Quality for price, please bid.