As we await the long-rumored and supposedly forthcoming Facebook bar, Facebook developer Matt Kelly used Greasemonkey to bring Facebook Likes to any web page. The browser extension does two things... and each very well: "Facebook Like adds the ability to Like any page on the web. Also, if you click the plus (+), it will show you Recent Activity and Recommendations for the website you're currently on."
It is simple. But, as we saw last week with the Microsoft Outlook / Facebook plugin, the addition of basic Facebook functionality and its social graph is a powerful addition to traditional formats. And as we have seen with Flipboard, Facebook's social graph is a powerful navigation mechanism for content. The Facebook Like extension builds upon each... and I suppose is a taste for what's to come.
A close up of the activity panel when expanded: