@organicmaps @rapha3l TagInfo only lists 301 uses of contact:mastodon=* globally, as opposed to >>10,000 for the top ones. Mostly concentrated in Europe, especially in Germany

https://taginfo.openstreetmap.org/keys/?key=contact%3Amastodon#overview
https://wiki.openstreetmap.org/wiki/Key:contact:*#Social_media,_messengers,_web_services