Review Posting To Google, Bing, Yelp from One Site

Hi, Would like code to insert in our website that will allow a user to write text in a textbox on our site, enter their login details for Google, Bing, or Yelp, on our site, and post that review to the sites the user has login information for for our company. If the user does not have an account at any of those sites then we popup the sites registration page for them to register. We need to capture which sites a review was posted to and send the user coupons by email accordingly.