Members of the Tales Community have the chance to participate in the Tales of the World: Radiant Mythology 3 Linked Site's Web Quest.
So what exactly do you do? Once logged in to the Tales Community and at the you will be prompted to choose a partner (a Tales character who is a new addition to the Radiant Mythology 3 roster) and a type of quest that you want to do. Quests you can choose from include Hunting, Collecting/Harvesting, Investigation, Researching and Treasure Hunting. After that, you can click Start Quest. Then on the next day, usually at 12:00, the randomly selected results of your quest with that Tales character will be posted. One quests can be filed daily. Depending on your result, you may even be able to view an unvoiced KaoDra skit.
And that's it. That's right, you don't really get to do much. Based on the results of your quest, you get to earn Mytholo Miles/MM (???????, maisoro mairu, which can be used to purchase items for your RM3 gameplay once the linked site's shop opens, most probably on the game's release itself.