The site has had a Reddit group for a few months now:
https://www.reddit.com/r/iafisher/. The creator posts weekly challenges every Monday, which I do in the World map. First I check which ones of the 10 places of my two groups, the "example towns" (consisting of Ariza, Spain; Aschersleben, Germany; Belvidere, Illinois, USA; Isernia, Italy and Rombas, France) and the "Sunray Union" (Huesca, Spain -glad my hometown is in

-; North Adams, Massachusetts, USA; and Dombasle sur Meurthe, Saffre and Wingen sur Moder all in France), fit the criterion chosen for the week, then fill the map with other places I know. So far every one has appeared at least once, and there have been weeks in which none has qualified (like this week, as none of them are on a coast) while a few other times three of them have qualified (like the week in which the creator asked for three of the same letter).