Where things become strange is that a lot of sites are basing their economy off of Google. They're doing exactly what those small nations did when things moved to a credit based economy.
Billboard Magazine style ranking uses your last.fm account to rank your favorite artists and albums based on normalized list of how long you've listened to each artist.
Ad-hoc exposure is not the same as a vaccine. Sure, a vaccine is a type of exposure, but a very systematically controlled one. No one in their right mind would decide to expose all of society to a virus just to see who would survive.