I’d like to know more about this.

• https://github.com/facebook (which includes the zsdt compression algorithm and the React web framework)

• https://stamen.com/launching-the-facebook-map-8d028c4f0e0e/

• https://wiki.openstreetmap.org/wiki/Organised_Editing/Activities/Meta

• https://github.com/facebook/RapiD

• https://rapideditor.org/