Creating a map of KDE contributors?

[Thomas Pfeiffer]

Hi everyone,
I recently realized that unless you ask fellow KDE contributors personally where 
they live, you don't really know where over the world (or even in your home 
country) KDE is spread.

I think this is a pity, given that knowing that would allow us to, among other 
things
- show the world how globally wide-spread KDE is
- make it easier to organize local events (like release parties or just local 
meetups)
- determine who could help with local FOSS events where KDE could participate
- pick locations for sprints or conferences depending on minimal overall travel 
effort

Therefore, I would like to create a map of KDE contributors' home towns (the 
towns/cities would be enough, no need to know the precise location). Ideally it 
would be possible for people to decide whether they want their name to show up 
publicly, or whether they just want to show up as an anonymous contributor.

So, two questions:
1. Does that make sense to you?
2. If yes: Does anyone know of a piece of code that allows people to enter their 
city of residence and then show people on a map (ideally as an OSM overlay), or 
could otherwise maybe create it?

Cheers,
Thomas