Found this suggestion buried under all the posts:
Possible troubleshooting tool for Activating the Feed Panel
- Scroll to bottom of the Farmville [opening] page
- Click on “SETTINGS”
- “Farmville Game Settings” will open up
- Line item #2, click the “check mark” off to DISABLE “Farmville zFeed Enabled”
- Refresh page.
- Now, repeat the tasks above but this time ENABLE “Farmville zFeed Enabled” by clicking the box.
- Hopefully this will fix your feed issues.