Facebook.com , the best community site in the world provide an option for all site owner to create a like button on there site by which users on the site can like that site. This liking is also automatically commented as status update in the profile of person liking... 

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This actually is an iframe from facebook.com.

example for wapka.mobi

Step 1. Login to your wapka.mobi account and enter admin mode.
Step 2. Click Edit Site and then go to xhtml/wml codes.
Step 3. Now just paste the code below, just replacing xxx with your site name and save it. Your fb like button is ready.. <iframe frameborder="0" width="100%" src="http://www.facebook.com/plugins/like.php?href=http://new4trick.com"></iframe>