Google Friend Connect : adding social features to your site

Google Friend Connect means more people engaging more deeply with your website -- and with each other. By adding Google Friend Connect to your site, you can give social network's effect to your website. Your users can easily invite friends from social networks and contact lists to visit and join your site. Just copy and paste a few snippets of code into your site, and Friend Connect does the rest.

Members Gadget : The Members gadget allows visitors to join your site, sign in and out, see other members, see pictures of their friends, explore other members' profiles, invite other people to join your site and use other social features. 

Wall Gadget : Allows viewers to post comments, or links to videos on your site.

Review & Rate Gadget : Allows viewers to rate a page, or a section of a page.

These are few gadgets which give social network effect to your website with minimal effort. So go and enjoy these cool gadgets.