I’m at a fun workshop on ‘vgi’ or volunteered geographic information organised by NCGIA. Everything from platial to OSM and mainly in an academic context. Check out Mike Goodchild’s paper on VGI, which mentions OSM and others.
Check out this vernacular map of the US from Common Census which were just shown in a presentation. It shows what city people feel part of. Have a look around the site and check out the other maps: