I use the undocumented Tags and Featured Image fields in my setup. I notice that the field values are not saved on a post update or publish. The fields are empty after an update or a publish event.
dshanske/indieweb-post-kinds (GitHub)

adds support for responding to and interacting with other sites using the standards developed by the Indieweb Community – dshanske/indieweb-post-kinds

This post should have some tags populated and visible in search.
Google

Georgios Papanikolaou’s 136th Birthday #GoogleDoodle

Could some places be marked as Private so that the location is not displayed when importing from Foursquare/Swarm?
beaulebens/people-places (GitHub)

People & Places. Contribute to beaulebens/people-places development by creating an account on GitHub.