Add image for Facebook shares
Created by: ehunter-usgs
Add a logo that can be displayed when people share a link on Facebook from earthquake, geomag, or landslides
addresses part of https://github.com/usgs/earthquake-eventpages/issues/265
Created by: ehunter-usgs
Add a logo that can be displayed when people share a link on Facebook from earthquake, geomag, or landslides
addresses part of https://github.com/usgs/earthquake-eventpages/issues/265