On my Facebook page OSMForHistoryBuffs, I’m following a group about holy wells in Ireland, because that is one of my peripheral interests when mapping. People post there about holy wells they have visited, often with a number of photographs. Sometimes people ask for an exact location and are given a googlemaps pin (ugh). When I feel like it, I try to find out where these holy wells are and add them to OSM, obviously I try to avoid the GoogleMaps pin. Often enough, the wells are on the British War Office layer and can be made out on Esri imagery anyway. Sometimes I do then post a link to OSM in that group saying “I’ve added it, look here”.

I’m not sure it is gonna make anyone start mapping, but at least OSM will be better than GoogleMaps as regards to holy wells.