Did you know you can sign in to Yahoo using your Facebook account? Through authentication Facebook application, you can sign in to Yahoo without creating or using Yahoo ID or password. By clicking on the "Sign in with: Facebook" button on the "Sign in to Yahoo" screen, you can link your Facebook account with Yahoo. So you can then interact and keep your Facebook conversation at Yahoo.
As a user of this application, you can take benefit from this one click sign in process. Some of the benefits include: playing Yahoo games, even you can also comment on Flickr photos. This will eliminate the step to sign into Yahoo without having to enter a Yahoo ID and password.