Placemark supports sharing maps using GitHub Gist, GitHub's simple pastebin service. By connecting your account, you can share any map in a few clicks and use GitHub as a preview or way for your colleagues to see your map.
Gists only support previewing GeoJSON files with maps, so any maps shared as a Gist will be shared as GeoJSON.
You can manage your account's connection to GitHub on the Account Settings page, and disconnect from GitHub if you'd like.
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