A fan listing is the list of people from various countries who like the same thing/s, people or person. This fan listing devoted to Pablo Aimar. And of course, he's not a diver not or a swimmer even though the seaside layout and the dolphin enter graphic showed it. He's an Argentinean football player who played for Valencia CF. Since we're his fan and we can't find any fanlist of him on the net, then we make one for him. Usually Pablo fans join this fanlist after read the rules. And in the next update of this fanlist, we will add their name at "fans" page.
So why there are official and unofficial fan listings? Official fan listings are the fan listings that listed at http://thefanlistings.org, the unofficial ones are not listed there. That's it! So, even though this site is an official fan listing, doesn't mean we have any connection to Pablo Aimar. We're just fans like others.
That's all that we can explain. If you still confuse and don't understand, please go to http://thefanlistings.org . If you want to know more about Pablo Aimar, please see the profile page.