It'll also be good if locations/cities couldn't be monopolised by a single large meetup. I attended a few HNLondon meetups back in 2012, but came away with nothing.
Smaller meetups might work better for actually getting to know people.
IP geolocation gives latitude/longitude. Maybe we could sort such posts by proximity. Whether they'd be comments or top-level posts would depend on the format I suppose.
It'll also be good if locations/cities couldn't be monopolised by a single large meetup. I attended a few HNLondon meetups back in 2012, but came away with nothing.
Smaller meetups might work better for actually getting to know people.