David, your impact on Shoppers need to know about mercury in fish! is shown on the map. Please invite some friends to join, which you can do either through this system, or with your method of choice.
How large is your personal impact? Here, you can see how many registered friends have passed on Oceana, and how far it has reached.
How many people passed on Oceana? See each degree of separation here:
Friends who have registered for Oceana are listed here.
Friends who've been invited to Oceana are listed here. They haven't yet registered.
These are the most active participants in Oceana. They've passed it on to the greatest number of friends, who have passed it on in turn.