comments module advice please

Hi, i would like people to be able to make comments on my website for articles such as http://www.in2town.co.uk/latest-uk-news/green-deal-energy-scheme-explained

I do not want them to sign up to my site as i feel this could cause problems and make my site slow but i could be wrong and would like to hear advice on this, what i am looking for is for people to be able to post comments on my site by being members of facebook and signing in that way, could you please let me know if that is possible

Maybe you should look at http://disqus.com/ this is not a typical Joomla! extension but surely you will find Joomla! plugin for this.

Maybe you should look at http://disqus.com/ this is not a typical Joomla! extension but surely you will find Joomla! plugin for this.

i installed it but nothing happens, any advice would be great. do you also have any example sites that use k2 and the same template that are currently using the built in comments option

In our demo templates we use only K2 comments, please just check how it looks http://demo.gavick.com/joomla25/twn2/index.php/template/2011-08-04-23-45-19/2011-08-04-23-47-02/k2-item