Error with Facebook like button in Joomla

Hi friends,

        I am developing a website in Joomla cms. I downloaded & used extension for facebook. After using it, I realized that it posts some irrelevant data. I don't know the reason behind it. Here is the code which I found on my facebook profile page :


Sample
Joomla! - the dynamic portal engine and content management system

        In place of above content, actually I want the text which should contain site information in brief.

        Can someone help me to figure out what went wrong & the way to work as I want??
        I really appreciate your help. Thanks.

well i think it is to do with your meta tags. facebook uses a specific meta to identify a page / page name / meta name. You can read more about it at facebook developers page

yeah but then, how to solve this issue?? Any suggestion??