Unofficial Facebook blog AllFacebook has launched Facebook Pages Tracker, which tracks stats across the 611,213 fan pages hosted on the social network.

Featured statistics include Top Pages, with Barack Obama's at #1 with 4,641,291 fans and a daily growth rate of 2.14%, followed by the Coca-Cola and Nutella pages:

Of the Fastest-Growing Pages, College Democrats of America takes the cake with 5568 fans and a daily growth rate of 1924.73%:

And finally, Cabaloosa's fan page tops the Least Popular Pages, with 1827 fans and a daily growth rate of -0.38%:

Statistics also indicate how a well-promoted events can improve fan page stats, TechCrunch points out. The New York Times, for example, enjoyed a leap of 135,000 fans resulting from an ad effort it ran on Facebook during the Inauguration.

Last month AllFacebook released demographic and app usage tools for the social network. Facebook itself recently also launched a new engagement-building ad that lets users participate in polls.