The heros_rumors script allows you to add rumors everywhere on the map, the script is highly configurable and allows you to control a lot of options!
You can set some preconfiguredin the config.lua to diffuse rumors on zones or all the map.
Players can add rumors too.
Automatic Database cleanup / command to do it too
Many options, check the config.lua screens
VIDEO
Install:
Just put the script inside your resources folder and ensure it on resources.cfg or server.cfg
Add the heros_rumors.sql file to your database
Here the general settings:
Here an example of zone configuration:

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