Active and activated are two very different things.The list only shows active (activated) members.
Signing up doesn't tie into reading or posting in the forums though. And there's no way that 87% of those who've activated their accounts read or post. Look at the number of people with ONE or ZERO posts and then look at their 'join' date and 'last visit' date.Well... that means 87% of the members are "active" (post or read regularly)