Search the extension directory for JSocial Comments. You will not be disappointed. I did a lot of looking and research today for my Joomla blog and I landed on JSocial as the best solution. It has all the Facebook integration (comments, likes, messaging, moderation) plus Plus 1, Buzz, Linked In, and Twitter. All with granular controls and flexible viewing options.
I'm happy that you find something that u like!!
But I'm not agree, cause this plugin is dedicated to FB and it's more easy to use and customize.
If u need an integration for twitter or gplus then take look to another plugin :