@obrhoff as for the “how” part, @everydoor is the best mobile POI editor I know. But there are two open questions:
1. How to find places that need verification.
2. How to mark a place as “validated.”
Maybe we could propose a Foursquare reference tag in OSM for correlation? A Foursquare place with an OSM place having a correlation ID AND a check data means an OSM mapper verified it.
Then we could build a (web based for now?) tool to help mappers find places to check.
Thoughts @zverik?