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If you use FarmvilleBot then you can download this plugin and it does it for you
you just set how many links to make and let the bot run

http://www.mediafire.com/?ojjdan345741543

For Charles only users

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 FarmService.getFuelForCoinsRewardUrl
Execute 1x
Next pop-up Edit Response .. AMF
Expand all and look for the reward link (fuelForCoinsReward)
Copy the link next to it
Execute 1x
Turn off Breakpoints

Now paste the link you copied to the end of this http://apps.facebook.com/onthefarm/
and share with friends