Google Maps lets users create their own maps that others can contribute to. Maps can be private, editable by invite only, or allow public edits. You can bookmark several of these user generated maps under the "My Maps" at Google Maps.
Here are step-by-step instructions for adding or editing locations in a shared Google map.
You can browse the directory of Google maps to add to your collection of maps. For example, there's one for real estate listings and gas prices.
Also check out the Wise Bread group writes that use collaborative maps:
If you're not logged in to a Google account, you'll see a link called Save to My Maps.
If you are already logged in, check the box next to the name of the map to add it to your maps.
Now that you've added the shared map to your My Maps, you can start adding location pins.
Google will pull some info about the location listing into the pin you just added to one of your maps. You can edit this information based on your map's purpose. Your changes only apply to that pin on your map.
Go find more useful locations to add to your map.
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