It seems that the visibility of such a post is a large factor in how effectively it fulfills its purpose. In my opinion, it warrants a discussion post.

I was just trying to figure out, short of asking in a post or an open thread, how many enthusiastic LessWrong users live in Tampa, Florida. Apparently Michael Vassar briefly stopped in Tampa a few years ago, and there was a meetup, but the chapter never began to meet regularly. If many people reported their interests and locations, it would facilitate the creation of new meetup groups.

I would also like to see that sort of thing circulated around survey time at the end of this year. You might consider reaching out to someone about that. People are primed to report large amounts of information during survey time. It would seem the most prudent time to request any such information.

Lastly, it's conceivable to me that ZeeMaps is not the only service like this. Which service to use is an entire decision in itself that could affect the efficacy of your plans. E.g. services with well-designed user interfaces are preferable to services with poorly-designed user interfaces because you don't want trivial inconveniences to be your data bottleneck, etc.