similar topic exists
and yes alam na alam ni SD yan. sya ang naglagay sa site dyan
and its not based on user ratings. its based on traffic volume (just like in alexa but the results in alexa also includes sites which are not based in the philippines -- i.e. yahoo, google)
see the frontpage you will see at the bottom the logo of topphilippinewebsites as well as pinoy topsites