Anti-bubba's reply is pretty thorough, the "snapshots" are of their toolbar users activity.
It's curious though:
FR is #1 in their activism category, #3 in politics, #13 in society (which includes politics).
Lewrockwell doesn't make it on to any of those lists, nor does it make it into the top five of libertarianism or objectivism sites.
I wonder what category Alexa lists them under.