I really wanted to write this post from a long time. But with lack of Blogging time i can’t post. Most major Web companies – Google, Yahoo, Microsoft, etc. – have announced support for OpenID, meaning that you can use your credentials from any one of those services to register and login to third-party websites that support OpenID. But Facebook is taking a big leap beyond all of these companies today by enabling you to login to its own site using either Gmail or OpenID. That means You can now link both your Google Account (including Gmail), MySpace, Yahoo ID and OpenID with your Facebook profile. ADVANTAGES The advantage of linking you other online accounts with Facebook is that if you are signed-in into any of the above services, you'll automatically be logged into Facebook as well. So for example, if you working in Google Docs or writing scraps in Orkut and then decide to open Facebook in another tab, you won't see the Facebook sign-in screen anymore. How To Link