Add more social media to your website! This is a free Google tool that lets website owners of any experience level add personalized social media features to their website.
I really like the members gadget. This gives you the ability to easily add a member feature to your website. You can also customize what information you ask for. This gives you the ability learn more about those visiting your site, priceless information!
Watch this short video for a quick overview of the options Google Friend Connect can bring to your website.
Here are some example sites for you to see Google Friends in action:
http://www.google.com/friendconnect/home/sites?hl=en