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Note: This is just changing the name so it will show something like
Blah Blah as planted a whole field of unwither rings
Make your normal neighbours think wtf lol

Load Farm
Load Charles
Turn on Breakpoints
Open Market
Look for UserService.publishUserAction
Change it to UserFeedService.logFieldPlantedEvent
Look for VisitMarket
Change it to the itemname of item you want it to say
Execute 2x
Turn off Breakpoints

No need to refresh , just go to the bottom of your farm and click "My Activity"
and you will see the post