All Face book users must be familiar with the Like Button till now. The Like Button enables you to quick share your likings and interests with your friends. This feature also helps website admins to let people share their content with their friends and expose it to larger audience. But just liking a web link may not be sufficient for people to understand you at a quick glance.
Now with this iFrame version you can add comment to any web content which provides the Like Button. This comment window can be brought up by hovering the mouse cursor over the Like Button. This feature with improve analytics will also allow site admin to send feeds to all the people who liked a specific page and track the spread of information through Facebook.
For more information check out Facebook developers webpage.
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