Google Friend Connect is a service from Google is live now.
How Can I make use of google friend connect for my blogging?
one can add social features to any blog. Like, your blog readers can join your blog (remember like myblogblog) via their Google Account and then add comments, rate pictures or even interact with other members who are part of your blog.
This improves traffic to your blog.
The most important is No programming is required for the blogger,
Just copy and paste a few snippets of code into your site, and Friend Connect does the rest.
Watch a video introduction
Will Add more in future.