http://archiveteam.org/index.php?title=Panoramio «On September 16, 2014, Google announced they would be "migrating" Panoramio over to Google Maps. During the migration, site features such as comments, favorite photographers, and groups would be deleted.»
I think Panoramio, as a source of geotagged photos, is several orders of magnitudes bigger than us (therefore, or because, Commons is no longer included in Google Maps). However, there may be an occasion for outreach here, among the disappointed crowd.
Last hear I manually sent a few hundreds WikiLovesMonuments invites to Panoramio users of Italy, the response was entirely positive though minimal (mostly because we have so few monuments allowed). I don't know what pitch to use though, especially if they're looking for comments and groups. I remember the Flickr Pro users missed the quality photography discussions and learning; if there is one such community in Panoramio we could try to merge it into Commons' Quality images and Featured pictures community, à la https://wikimania2014.wikimedia.org/wiki/Submissions/How_Commons_made_a_qual...
Nemo