"People Talking About" Facebook

Facebook social networking site launches new metric what people talking about. It's has overhauled Pages Insights analytics tool and added a new metric to gauge the health of a page.
That statistic, which users will see on Pages below the total number of "likes", will be one of four tracked by pages Insights. The idea is that users will understand a Page with a high people talking about rating is one that has compelling content. Likewise, content creators will be motivated to make their Pages more comment-worthy.
People Talking About will measure user-initiated activity related to a Page, including posting to a Page's wall, liking, commenting, sharing a Page post or content on the Page, answering a Question posed to fans, mentioning a Page, "liking" or sharing a deal or checking in at your Place.
David Baser, Product manager for Pages Insights, says that despite a raft of new activities that Facebook will be introducing soon under the Facebook Gestures banner, those four metrics will remain and the "like" will maintain its ranking as a top measurement. Likes are an expression of identity, Baser says "it's a user saying that I have a relationship with this brand.In addition to tracking the four metrics. Pages Insights will also offer a deeper dive into data around specific updates. Facebook will list your last 500 posts and count the total  number of engaged users. People Talking About it and virality. The latter measures the percentage of users who commented on the post.

People Talking About Source ; http://mashable.com/2011/10/02/facebook-people-talking-about/