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Note : This changes your name permanently , but you can always change it back using the same method . as stated by Plinko dont use it on your main account , if you want to use it , use it on dummy accounts 

Load Farm
Load Charles
Turn on Breakpoints
Open Market
Charles pop-up ..Edit Request .. AMF
Expand all and look for UserService.publishUserAction
Change it to UserService.setUserName
Look for VisitMarket and Change it to the name you want to
Execute 2x
Turn off Breakpoints & Refresh your farm
Now whenever you post to your feed the name will be what you changed it to 






You will see in the screenshot below the name of the account posting now is
FarmvilleItemCodes