Check your settings to see if you blocked Farm Town by accident. I the Apps window mouse over Farm Town, and a pencil will appear to the left. Click on it, and review the setting. It should not be "Blocked"
Also, the lick below will show all of the Farm Town posts.
https://www.facebook.com/?sk=app_56748925791
I'd recommend once you click on it, you book mark it in your browser. That way you have it, and can go to it anytime you want in the future.